The best open source alternative to WYSIWYG Web Builder is Silex. If that doesn't suit you, our users have ranked more than 50 alternatives to WYSIWYG Web Builder and 14 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to WYSIWYG Web Builder are Bluefish Editor, KompoZer, VvvebJs and Amaya.
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Bluefish is a powerful editor targeted towards programmers and webdesigners, with many options to write websites, scripts and programming code. Bluefish supports many programming and markup languages, and it focuses on editing dynamic and interactive websites.
No way to make it WYSIWYG.
KompoZer is a complete web authoring system that combines web file management and easy-to-use WYSIWYG web page editing.
Amaya is a Web editor, i.e. a tool used to create and update documents directly on the Web. Browsing features are seamlessly integrated with the editing and remote access features in a uniform environment.
The eXe project developed a freely available Open Source authoring application to assist teachers and academics in the publishing of web content without the need to become proficient in HTML or XML markup. Resources authored in eXe can be exported in IMS Content Package, SCORM 1.
Nvu (pronounced N-view, for a "new view") is a complete Web Authoring System that combines web file management and easy-to-use WYSIWYG (What You See Is What You Get) web page editing. Nvu is designed to be extremely easy to use, making it ideal for non-technical...
A text editor for GNOME that combines simplicity with power.
Scribes focuses on streamlining your workflow. It does so by ensuring common and repetitive operations are intelligently automated. And also by eliminating factors that prevent you from focusing on your tasks.
The res.
Quanta Plus is a web Integrated development environment (IDE) for HTML, XHTML, CSS, XML, PHP and any other XML-based languages or scripting languages. It is part of KDE, a Linux desktop environment, released in the Kdewebdev package.
Maqetta is an open source project that provides WYSIWYG visual authoring of HTML5 user interfaces. The Maqetta application itself is authored in HTML, and therefore runs in the browser without requiring additional plugins or downloads.
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It's a good software, but not a WYSIWG (drag-and-drop) editor.