Onfinity (formerly VIENNA Advantage) is an open source ERP and CRM built for manufacturers and used well beyond them. The community edition, Pluto, is the same code as the paid editions: accounts, purchase, sales, stock, manufacturing, HR and projects on one system. No user limit, no time limit. Eclipse Public Licence; extensions stay yours.
The platform is the point for developers. The Application Dictionary is the low-code layer: windows, tabs, fields, validation rules, workflows, processes and reports are defined as metadata, so a vertical built on Onfinity does not fork the core and survives every upgrade. Dashboards, a report writer, a REST API, a mobile app, and the Onfinity Market for module updates and add-on modules, most of them free. Multi-company with its own books, calendar and currency per company; multi-currency; multi-language.
Technology: C# / .NET on IIS, an HTML5 client in the browser, PostgreSQL 12 or later or Oracle 12c or later. The source code is on GitHub. Packages, cloud images for AWS and Oracle Cloud and setup guides are on the download page; the free community registration opens the documentation, video tutorials, online training and 30 days of support.
For manufacturers: multi-level bill of materials, work orders, multi-level MRP, make to order with the sales order line on the work order, batches with expiry, landed cost on imported inputs. Job work costing, quality checks and production costing are modules of the paid editions.
Editions: Pluto (free, self-hosted); SME Cloud (hosted, per user per month, with a support desk, payroll and country tax modules such as India GST and e-Invoicing); Nova (several plants or companies, cloud or own servers, by quotation); Galaxy (groups and public bodies).