Phoenix is a modern open-source Code Editor for the web
Apache NetBeans
Modernized fork of NEdit, with unicode support and AA text rendering
A powerful editor and graphical debugger for code written in Scilab
Kile is a feature-rich LaTeX editor
A hackable text editor for the 21st Century
Web IDE in single HTML file
A modern, lightweight yet powerful text editor
CodeLite: an open source, cross platform C/C++/PHP and JavaScript IDE
A lightweight programming environment for Java
Electronic design and programming tools suite like Eagle, MpLab
Develop AMX NetLinx projects in the Sublime Text editor.
Develop Crestron Simpl+ modules in Sublime Text.
Graph algorithms interpreter, IDE, debugger, 3D visualizations.
JetBrains Meta programming System