Tinn-R Editor - GUI for R Language and Environment
PiNote is a free source code editor that supports several languages.
Delphi : VRCalc++ OOSL & + (Paged List, TextEditor, VRAstroVision ...)
Customizable multiplatform development environment.
A small programmer's editor.
Markdown engine for Unix terminals
Pascal XE is an easy to use IDE for Pascal programming.
Tools for developing qooxdoo Web apps
Ultra Lightweight Universal IDE