SCons is an Open Source software construction tool—that is, a next-generation build tool. Think of SCons as an improved, cross-platform substitute for the classic Make utility with integrated functionality similar to autoconf/automake and compiler caches such as ccache. In short, SCons is an easier, more reliable and faster way to build software.
"SCons is a fantastic build system, written in Python (1.5.2) that does lots of nice things like automated dependencies, cross platform operation, configuration, and other great stuff. I would have to say that it is probably going to be the best thing for building C/C++ projects in the near future." — Zed A. Shaw, Bombyx project lead