Phoenix is a modern open-source Code Editor for the web
Apache NetBeans
Kotlin code completion, diagnostics and more for any editor/IDE
A web based file manager, web IDE / browser based code editor
Learn Java the easy way!
A powerful editor and graphical debugger for code written in Scilab
Web IDE in single HTML file
IDLE Extensions
Launch an external diff tool like WinMerge in Eclipse
Develop AMX NetLinx projects in the Sublime Text editor.
Develop Crestron Simpl+ modules in Sublime Text.
Graph algorithms interpreter, IDE, debugger, 3D visualizations.
Python script coding editor that debugs as you write
JetBrains Meta programming System
An Eclipse plug-in for the IBM FileNet P8 Content Engine and CMIS