A free C, C++ and Fortran IDE
Phoenix is a modern open-source Code Editor for the web
Apache NetBeans
A web based file manager, web IDE / browser based code editor
Kotlin code completion, diagnostics and more for any editor/IDE
AstroNvim is an aesthetic and feature-rich neovim config
CLI, SDK, and IDE plugins for Duel Agents
Rapid applications development tool and libraries for FPC
Lightweight and easy to use cross-platform C++ IDE
TclTk-IDE for development and testing tcltk-apps
Learn Java the easy way!
A powerful editor and graphical debugger for code written in Scilab
Kile is a feature-rich LaTeX editor
LiteIDE is a simple, open source, cross-platform Go IDE.
A hackable text editor for the 21st Century
Web IDE in single HTML file
Open Source C & C++ IDE for Windows
A syntax highlighting, code folding text component written in Swing
IDLE Extensions
Launch an external diff tool like WinMerge in Eclipse