Naturally, source code for all of these tools is also available. The tools needed to build Mozilla are described on the build page for your platform.
Details are on our CVS page.
Reference page for details. Check out the Bonsai page for details. Tinderbox Tinderbox is for knowing when the tree is in flames. It is how we are able to tell when a checkin has broken the build on some platform, and how we know which person needs to be viciously flogged. See the Tinderbox page for more.