Development Utilities
- Mesa demos collection
 - includes several utility routines in the 
src/util/directory. - Piglit
 - is an open-source test suite for OpenGL implementations.
 - ApiTrace
 - is a project to trace, analyze and debug graphics api's.
 - Valgrind
 - is a very useful tool for tracking down memory-related problems in your code.
 - Coverity
 - provides static code analysis of Mesa. If you create an account you can see the results and try to fix outstanding issues.