Unit Test for C is a very useful and powerful software development tool for C and C++ programmers. It is designed to provide a great deal of functionality in a very small package and functions nearly identically on Windows and UNIX systems.
Kelp is a source code annotation framework. Written in strict ISO C90 with support for Posix and Windows environments. Large file support. Supports both 32 and 64 bit platforms. Plugins for Vim and Eclipse are available.