MobiPDF (formerly PDF Extra)
                
                MobiPDF (formerly PDF Extra) is an intuitive reader and editor that allows you to read, edit, create, OCR, organize, annotate, fill and sign, convert, and share any PDF. This makes MobiPDF an excellent choice for users seeking a budget-friendly alternative to Adobe Acrobat Pro. 
HERE’S WHAT YOU GET WITH MOBIPDF: 
Multiple Page View Modes: Enjoy a distraction-free "Read Mode". 
Advanced Editing Tools: Experience a Word-like PDF editing environment. 
Two-Way Conversions: Convert PDFs to and from Word, Excel, PowerPoint, or image formats. 
OCR Support: Make scanned documents searchable. 
Markup Tools: Highlight, comment, strikethrough, stamp, and more to enhance your documents. 
Effortless PDF Organizer: Reorder, compress, split, and combine PDFs with ease. 
Sign & Secure: Add signatures, create and fill forms, and protect your PDFs with passwords, encryption, and digital certificates. 
Offline Mode: Work freely on your projects, even offline. 
Seamless translation: One-click translate any PDF into 50+ languages. 
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                RAD PDF
                
                Install-free PDF editing, form filling, redaction, signing, viewing, and more on your website with RAD PDF!
Packaged as an easy to use library / WebControl (compatible with .NET 3.5+, .NET Core, and .NET 5+), RAD PDF can be used with just about any flavor of ASP.NET including MVC, Razor, Blazor, WebForms, and more.
RAD PDF is compatible with 99% of internet browsers, including those on Linux, Mac OS X, Microsoft Windows, and mobile. No plugins. No Adobe Reader. RAD PDF is more than a PDF to HTML converter. It natively supports all the most common PDF features including annotations, bookmarks, form fields, page labels, and more.
With advanced PDF options, RAD PDF allows you to selectively enable and disable features not available with Adobe Acrobat Reader, like protecting a PDF from being downloaded while still viewable online.
RAD PDF users can use PDF form fields directly from the web browser by enabling PDF form filling and PDF form saving without having to install any software. 
Integrating directly with ASP.NET, RAD PDF allows your web application to capture input data, build custom workflows, and provide an intuitive graphical user interface (GUI) for just about any online PDF interaction imaginable!
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                Trumbowyg
                
                Trumbowyg is a lightweight, customizable jQuery plugin that offers a visually appealing design while generating clean, semantic code through its robust API. It is specifically optimized to support HTML5 and is compatible with modern browsers, including IE9+, Chrome, Opera, and Firefox. While most WYSIWYG editors exceed 45kB, Trumbowyg maintains a compact size of just 20kB, ensuring quicker page load times. The plugin includes only essential features, allowing for the generation of tidy and semantic code tailored to your needs. Users have the flexibility to fully customize options and designs; however, its default design is enhanced for Retina displays, ensuring an excellent and straightforward user experience. Additionally, Trumbowyg supports the creation of custom plugins, which can be submitted via pull requests on its GitHub repository, along with the possibility to develop your own packages or utilize pre-existing ones. An extensive list of known packages for Trumbowyg is available for users. As an open-source project licensed under MIT, Trumbowyg is entirely free to use, making it an accessible option for developers everywhere. This combination of features and flexibility makes Trumbowyg an ideal choice for those seeking a powerful yet efficient text editor.
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                Summernote
                
                Summernote is an extremely user-friendly WYSIWYG editor built on Bootstrap, which can be effortlessly installed by downloading and linking the JavaScript and CSS files along with Bootstrap. You can tailor your experience by initializing a variety of options and modules, allowing you to see all the practical features of Summernote in action. Licensed under MIT and actively maintained by the community, it is compatible with various back-end frameworks. There are also third-party integrations available for platforms like Django, Rails, and Angular. This editor supports Bootstrap versions ranging from 3.x.x to 4.x.x and is notably lightweight, with the combined size of the JavaScript and CSS files being only 100KB. It offers an intuitive user experience and is compatible with all major browsers, including Safari, Chrome, Firefox, Opera, Edge, and Internet Explorer 9+. Additionally, it works seamlessly across all major operating systems, including Windows, MacOS, and Linux. To quickly get started with Summernote, you can download its precompiled and minified CSS and JavaScript versions, and keep in mind that Bootstrap requires specific HTML elements and CSS properties that necessitate an HTML5 doctype for optimal functionality. Moreover, the editor's flexibility allows developers to easily adapt it for various use cases and requirements.
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