Development toolkit for Web Services and XML data bindings for C & C++
A C-like, high level programming language and interpreter.
Single sided linked list (kind of lib with test-code, C, C++ and java)
HomeKit Accessory Development Kit (ADK)
Simple ncurses-based text editor for your Linux terminal.
Electronic design and programming tools suite like Eagle, MpLab
A readable lisp in less than 1k lines of C
Some Useful C-Utilities