From BlenderWiki

Development Tools

Services

• SVN Checkout and Usage: how to check out and commit source code to the SVN server
• BuildBot: automated builds at builder.blender.org
• Code Review: online tool to review code before committing
• Clang static error checker

Debugging

• GDB: debugging on Unix system
• Valgrind: detecting memory errors (linux/osx only)
• BuGLe: OpenGL debugging
• Py from C: running python code from C

Guides

• Coding Tips: how to navigate the code and debug problems