Best Billing and Invoicing Software for Linux of 2026

Take productivity to new heights with Hubstaff! Hubstaff offers time-tracking apps for your desktop, web browser, or mobile device. Once you start tracking time to a task, Hubstaff will quietly run in the background as you work, consuming virtually no resources. You can easily switch between tasks or stop tracking with just a few clicks. Tracking your team's efficiency can be a challenge, but we've equipped Hubstaff with several great features to help you determine how they perform. Hubstaff works best when you have clear expectations for your team. It helps you determine each team member's average productivity levels to identify improvements or declines in their performance over time. In other words, the more you use Hubstaff, the better the results you'll get. Available for Mac, Windows, Linux, iOS & Android.

Odoo is an open-source, fully customizable and extensible software that includes hundreds of professionally designed business applications. Odoo's intuitive database can meet most business needs including CRM, Sales, Projects, Manufacturing, Inventory, Accounting, and Accounting. Odoo is a software solution that can be used to meet all company needs, regardless of size or budget. Odoo's seamless design makes it easy for businesses to become more efficient and save time. Each module is interconnected to offer a seamless experience from one app to the next. Users can automate many tasks that would otherwise require manual inputs to multiple applications. Odoo enables teams to collaborate with each other from one platform, allowing them to keep all business functions in one place.

Zahara takes care of the invoicing process from the supplier's perspective, managing the invoices that your business receives. Instead of generating bills for customers, Zahara enables finance teams to efficiently capture, verify, approve, and process incoming invoices without the need for manual data entry. Suppliers send their invoices directly to Zahara's Invoice Inbox, where intelligent algorithms recognize the supplier, extract detailed line-item information, and match each invoice to its corresponding purchase order and delivery receipt. The invoices are then directed for approval based on site, department, project, or entity, and once approved, they are included in payment cycles, accommodating multi-currency transactions through Currencies Direct. The financial impact can be monitored throughout the entire process, and each invoice includes a comprehensive audit trail. Zahara integrates seamlessly with accounting systems such as Xero, Sage 50, Sage 200, QuickBooks Online, and MYOB, ensuring invoice data syncs effortlessly without any duplication of effort. The implementation process is streamlined to take just weeks rather than months, with dedicated support available from a UK-based team.

The Invoice Application Designed for Independent Mechanics. A User-Friendly Solution for Managing Invoices, Customer Information, and Work Orders. LoTech caters specifically to independent mechanics, whether you're operating from your home garage, servicing vehicles in a customer's driveway, or traveling between appointments. With this tool, you can effortlessly generate professional invoices, keep track of your customers, and oversee work orders, all conveniently consolidated in a single platform. This integration simplifies your workflow, allowing you to focus more on your craft and less on administrative tasks.

WorkDash is an online platform designed for business management, allowing entrepreneurs to oversee all aspects of their operations, including marketing, workforce management, and invoicing. Users can utilize the full suite of features or select specific tools that cater to their business requirements. This flexibility makes it an ideal solution for various types of organizations, regardless of their size or industry.

1CRM is a highly customizable All-in-One CRM built for comprehensive management of small-to-medium businesses. Its core strength is the integration of order management (quotes, invoices, product catalog, purchase orders, inventory tracking and more), customer service and project management within a unified CRM framework.

Invoice Fly offers a hassle-free, free online invoicing solution tailored for freelancers, small business owners, and entrepreneurs looking to simplify their billing processes. No account creation or registration is necessary, allowing users to generate professional, branded invoices quickly and efficiently. The platform provides a range of customizable invoice templates to help you create a consistent brand identity that resonates with your clients. After designing your invoice, you can easily export it as a high-quality PDF that’s ready to be downloaded, printed, or sent via email. Invoice Fly helps reduce the time spent on paperwork and administrative duties by streamlining invoicing tasks. Its polished, professional invoice appearance can enhance client trust and encourage timely payments. The straightforward interface makes it accessible for users with varying levels of technical skills. Overall, Invoice Fly is a practical tool to maintain smooth and professional billing workflows.

CrossConcept Continuum is more than traditional PSA solutions. It incorporates cutting-edge UI technology, making it easier to use the solution. This reduces clicks and time spent logging data. CrossConcept Continuum integrates with all major accounting systems, allowing you to seamlessly synchronize your accounting and projects within one unified system. Our innovative PSA solution allows organizations maximize profitability by integrating financial accounting and connecting projects. This allows you to manage all stages and deliver on your promises, from conception to completion. CrossConcept has decades experience in helping service companies automate their processes. CrossConcept has worked with clients ranging in size from a few people to more than thirty thousand. CrossConcept Continuum was born out of real-world experience by the founder and his team. Our solution is a simple but powerful PSA!

The CRM Firmao software will allow you to create a customer database which will allow you to reduce the time it takes to acquire customers, increase conversions at all stages of the sales process, and efficiently and comprehensively service your existing customers. Firmao is a tool that helps to manage the sales department's work, including the sales funnel. It also acts as a contact centre for customers who are regular customers of the company. Simple management of your customer base Multiple Opportunities - - Automating the sales process - Increasing sales volume - Effective contact with customers - Comprehensive customer service - Execution orders for customers It is used in companies that require regular contact with leads and contractors. Firmao's CRM software can be used to plan dynamic development. Firmao's CRM software is simple and fast to implement. It takes approximately 1-2 weeks.

OneBill is an integrated subscription management, billing and revenue management platform that powers customer lead-to-revenue generation. OneBill supports all types billing models, including subscription billing, usage-based billing, one-time billing, and subscription billing. Open APIs make OneBill easy to integrate with other enterprise systems, such as payment gateways, carriers & service providers and accounting & admin. The platform covers all aspects a business, including CPQ, automated order activation, billing & Invoicing, billing & invoicing, revenue reporting, customer subscription management and channel partner commission management. OneBill is a revenue management and billing solution that integrates with the most trusted solutions in the world. It has helped SMBs, SMEs and large enterprises reduce billing errors, compliance risks, and drive greater efficiency.

Are you looking to increase your sales? Do you want to improve customer relationships? Are you interested in contributing to the fastest-growing open source project on GitHub YetiForce is completely free to use. You can manage 12 business processes within your company with YetiForce's assistance, regardless of its size. YetiForce's open-source code was released under a flexible and generous license. This has created a large and active community for the project. It doesn't matter if your profession is in programming or if you just enjoy software development. Get YetiForce free of cost and discover why more than 250 000 people already use it.

Vcita is an all-in one business management app designed for small and medium-sized businesses. vcita offers a wide range features that help SMBs streamline their daily tasks and operations, and improve their interactions with clients. This will allow them to grow and succeed. The top features include client and calendar management as well as billing and invoicing, online scheduling and lead capturing. vcita integrates with dozens more platforms, including Facebook and Quickbooks.

Plus & Minus, an integrated enterprise resource planning (ERP), financial platform, is built around a single file system. Plus & Minus offers collaborative tools for accounting and purchasing, managing sales, reporting operations, and other functions. Plus & Minus allows users to track sales, manage core finance operations, create custom business reports, and monitor documents. Plus & Minus allows users to deploy on-premises or in the cloud.

Perfect Billing System is a billing and customer management system for businesses. It simplifies the creation of invoices and the dispatch of them, and facilitates tracking payments efficiently. It also provides comprehensive financial reports. The system is also flexible, supporting multiple payment methods and currency adjustment. The system's features are designed to reduce errors and improve financial accountability. It also enhances business operations by providing detailed expense tracking and real time financial oversight.

Clockify by CAKE.com is a time tracker and timesheet app with a user-friendly interface, an easy onboarding process, and a carefully selected set of features that meet customer needs precisely. What makes Clockify stand out is that its time tracking is rather intuitive, and all the data can be saved and then used for analysis with Clockify Reports. Another key aspect of Clockify is financial management. Users can mark their time entries as billable or non-billable. Then, they can easily issue invoices for the billable hours only — no manual calculations required. This also increases billing accuracy and enables more efficient budget management. One of the main benefits of using Clockify is that you can easily manage your team’s schedule, time off, and workload. You can implement PTO policies and have your team request time off through Clockify. And, you can define shifts for your employees and projects/tasks they should focus on, all in a single tool. Once set up, you can view your team’s tasks on a timeline and analyze its capacity, making sure no one is underutilized or overwhelmed with tasks. With reports, you can even see and analyze whether you’re spending too much time on certain tasks, and how to better allocate the time at hand. Insights like these are invaluable in defining future projects and task allocation on a daily basis. Clockify integrates with over 100 apps, including popular options like Jira, Zapier, Gmail, and more. Clockify integrates with other CAKE.com apps, Pumble and Plaky, too. Clockify is made by a company established way back in 2009. You get 24/7 human customer support to Clockify users on all plans (including the free one).

QuickBooks Online is the most widely used accounting software in the entire world. QuickBooks Online simplifies accounting. Accounting software for small businesses that is #1 makes it easy to track receipts, income, transactions and more. You can take photos of receipts to link them with expenses. Our agents are available to answer any questions you may have about QuickBooks. Keep your business running smoothly by using the apps that you love. QuickBooks Online is compatible with PCs, Macs, tablets and phones. Click the link to get a 30-day free trial, and 50% off for your first three months. QuickBooks is more than just accounting software. QuickBooks helps you keep track of your income and expenses so that you can prepare for taxes. Customers save an average of $3,534 per year.

AI Time Tracker captures every billable hour automatically. You see live margin, not end-of-month surprises. How profitable is the project you are working on right now? If the honest answer is "I'll know when invoices go out," that's the problem. TimeCamp's AI Time Tracker logs hours in the background as your team works, so the margin on every client and project updates in real time. AI Time Tracker fills in timesheets automatically based on activity, no manual entry Live margin on every client and project, updated as work happens Time, attendance, invoicing, and budgeting in one place Connect 80+ tools you already use, from Jira to QuickBooks Built for teams who want facts, not Friday guesses Stop guessing. Start knowing.

Our cloud-based mailroom allows you to send documents remotely directly to the U.S. Post Office. DocuSend can be used with any accounting, billing, or CRM software that creates PDF documents that contain a valid mailing address. Developers can integrate our REST API into their software to provide a "Send mail" button. This can be used as a reseller option or internal direct connectivity. Any business or organization that needs to print and mail documents on demand can reap the enormous economic benefits. QuickBooks Online users get 33% off first DocuSend upload. See website for details.

Finally is an all-in-one accounting platform that blends advanced AI-powered software with hands-on expert support to streamline your business finances. Built for small and medium-sized businesses, Finally offer solutions for bookkeeping, taxes, payroll, expense tracking, and corporate credit cards, along with expert support to help you stay on top of your finances. We simplify financial management, helping you stay organized, save time, and avoid unnecessary IRS penalties. With Finally, you get both cutting-edge technology and personalized service, so you can focus on scaling your business stress-free.

Simplain Vendor Portal is used by some of the leading retailers in the world to streamline their supplier collaboration. By implementing the solution, retailers and wholesalers can realize immediate gains in productivity, speed to market and establish a solid foundation for other digital transformation initiatives. The platform helps facilitate workflow driven collaboration / negotiation with suppliers for key business processes such as Vendor Onboarding, Item Management, Cost management, Deals & Promotions management, Purchase Order Management & Invoice Management. Simplain Vendor Portal is capable of integrating with GDSN providers to synchronize item attributes, nutritional and product certifications and digital assets. The system also provides REST APIs for bidirectional communication with the back end ERP systems. By making the suppliers accountable for their own data, Vendor Portal helps retailers achieve better data quality and gather richer data.

A web-based software application that is tailored to the client's specific needs. Our services are simple to use and easy to implement. It takes only minutes for a company or individual to use our services. We understand how valuable your time is and have created a turnkey service that will help your business grow. Talygen is simple to use, access, and implement. Talygen allows clients to track and manage their projects, employee progress and performance, profitability reports, and many other things. Talygen offers an easy-to-use online portal, a desktop application with screenshot functionality, and a mobile application tracking system that can be accessed via your Android Smartphone, iPhone, Windows Phone, or Windows Phone. There is finally an online tool that allows businesses, employees, contractors, and everyone else to track their expenses. The key to running a successful business is expense tracking.

iM3SCM Suite is a cloud-based suite of tools that digitally transform the supply chain of an enterprise. It automates Warehouse, Distribution Center & 3PL Operations, multichannel order management, and warehouse, distribution center & 3PL operations. We have the expertise to choose technologies from Mobile Computers Scanners & Barcode Readers, Automated Guided Vehicles. API integrations into Shipping (Fedex UPS, USPS LTL), fleet manager Accounting Software Quickbooks Online/Desktop SAGE, Fedex, UPS, USPS LTL), and shipping (Fedex UPS, USPS LTL), Digitally Transform your Asset & Facilities. Repair management, Dealer and Distribution Management, Field Service & Fleet Management Yard Management Rental Management of Assets Track Technician, Time & Labor and many more. iM3 SCM Suite comes with Mobile Apps (phones/tablets), which allow you to manage different functions of your operations either in-house or remotely. To improve productivity, efficiency, quality and reduce costs, choose the best technology for you enterprise.

InvoiceTemple was designed specifically for small business owners. Our app provides a user-friendly platform that allows entrepreneurs to create professional invoices with ease. InvoiceTemple offers a variety of features that make invoicing easy and efficient for even the most tech-savvy users. InvoiceTemple gives you access to a variety of customizable templates that allow you to customize your invoices to include your logo, your business details, and your unique scheme. This level of customization not only enhances professionalism, but also strengthens brand identity and instills confidence in your customers and clients. Invoice Temple also seamlessly integrates purchase orders and purchase records. This eliminates the need for manual data input and ensures accuracy in your financial records.

My Member Software is a frontend user-friendly member administration software that is open source and downloadable. Associations, Clubs and Foundations can manage their members. It is integrated into the CMS Joomla, but can also be used alongside a Wordpress and Drupal website. You can manage your members from anywhere, at any time. For a hassle-free setup, you can choose to have it done by yourself or with us. We are also interested in partnerships with webdesigners and accounting firms.

Paymo is a collaborative work management software that allows small and mid-size teams and individuals to get their job done wherever they are. The software bundles advanced task management, resource scheduling, native time tracking, and invoicing under a single platform - eliminating the need for any messy and costly integrations.