Readable Lisp/S-expressions with infix, functions, and indentation
A .NET/Mono library for string-based user interface localization.
Plugin performs preview of documents written in some markup languages.
Codemirror Component for React.js
Vastly improved Javascript indentation and syntax support in Vim
Core Data Editor lets you easily view, edit and analyze applications
Compile and run Java programs without using command mode!
A C Compiler/Editor for Retro 6809 Machines (Colour Computer/Dragon)
An aggregation of tooling for using ES6 today
A fast, powerful and adaptable GUI solution
Electronic design and programming tools suite like Eagle, MpLab
DocBook Editing and Processing for Eclipse
yEdGen can open a flow chart and generate ANSI C code from it.
A layout and widget editor for Wt (C++ web applications)
A PlantUML editor written in Qt4
Pure Trait-based Programming on the Java Platform
Cress is a comprehensive toolset for graphical service/workflow design
Commentary.vim: comment stuff out