Development

• Peacock
  Peacock is an HTML Editor for GTK+/GNOME. It supports most of basic HTML. Its features include MDI (using GnomeMDI), Drag N' Drop, Session Management, and HTML Preview (using GtkHTML). ...
  
• RADpage
  RADpage is a rapid application development system for dynamic, data-driven Web applications. It directly operates inside the browser without requiring a client-dependent development environment. RADp...
  
• Quanta Plus
  Quanta Plus - at its most basic - is a text editor optimised for web development. As well as providing a means to edit code, there are additional features that make the developer's life easier. So, i...
  
• MapGenerator
  Map Generator is a program for creating client-side image maps in HTML files. It works with Linux. ...
  
• Galway web weaver
  Galway is an GNOME HTML editor with features like Java Script, VRML 2.0, Script-fu and PHP support in additional to ftp publishing, local html previewing, and full scripting capabilities. ...
  
• erwin
  erwin is a simple html editor based on GTK2. ...
  
• WebSiteRobot
  WebSiteRobot is a graphical tool to create and host professional Web sites in one simple step. No HTML, FTP, or Web hosting company are required. It includes a shopping cart, automatic thumbnail crea...
  
• Demoroniser
  Using Microsoft applications to create Web pages runs the risk of publishing pages which appear to be the product of a semi-literate moron when read on non-Microsoft platforms. Demoroniser corrects a...
  
• WebMake
  WebMake is a simple Web site management system, allowing an entire site to be created from an optional set of text and markup files and one WebMake file. It requires no dynamic scripting capabilities...
  
• August
  August is a free html editor for the UNIX platform. It's a non-wysiwyg editor - like Aswedit or Hotdog. It's written with the Tcl/TK scripting language and graphical toolkit. It's distributed as a si...
  
• cuneAform
  This project has been designed to create a HTML Editor that anyone can use. It's just like typing a document thanks to the editors WYSIWYG (What You See Is What You Get) interface. The editor has...
  
• beefy
  Beefy is a simple HTML editor based on the GtkHTML component. It's a great tool to create simple pages, in a WYSIWYG manner. ...
  
• textslides
  textslides generates a set of HTML slides from a single plain text file. The output can be used for a presentation or for a web site. ...
  
• FCKeditor
  FCKeditor is an HTML/DHTML editor for ASP, ASP.NET, ColdFusion, PHP, and JavaScript. It's really lightweight and doesn't require any kind of installation in the client computer. ...
  
• edit-on Pro
  edit-on Pro is a cross-platform, in-browser, WYSIWYG editor Java applet which enables XHTML content authoring with XML markup. The editor is compact, powerful and requires no special libraries or cli...
  
• Arachnophilia
  Arachnophilia is a fully fledged and very easy to use Web editor that uses Java, making it truly OS independent. ...
  
• Contenido
  Contenido is a CMS (content management system) for the Web environment. It features advanced user management, in-site editing, a WYSIWYG editor, and more. ...
  
• TEA for Linux
  TEA is a modest and easy-to-use GTK+2-based editor with many useful features for HTML editing. ...
  
• KTML
  KTML is a browser-based WYSIWYG HTML editor that facilitates easy content formatting using its advanced table and image manipulation features. Unlike other online editors, it supports most platforms ...
  
• Quanta Gold
  Quanta Gold is an enhanced and expanded version of the open source project Quanta, sponsored by theKompany.com. It is a powerful point and click Web editor with CSS support, syntax highlighting for H...
  
• Insight, the GDB GUI
  Very good front-end for gdb. Can be controlled with mouse and with standard gdb commands. ...
  
• UPS
  UPS is a source level C and C++ debugger that runs under X11. Fortran is also supported on some systems. It's a very light debugger, but is quite efficient and works well. ...
  
• The HT Editor
  HT is a file editor/viewer/analyzer for executables. ...
  
• Code Medic
  The standard Linux / UNIX debugger, gdb, is extremely powerful, but its command line interface can be quite intimidating and painful to use. Code Medic is compatible with all versions of gdb and prov...
  
• Fenris
  Fenris is a multipurpose tracer, debugger, and code analysis tool that detects and documents high-level language constructions, can recover symbols, graph program execution flow, detect internal func...