A file-based cross platform build system. It uses a directed acyclic graph (DAG) and is therefor pretty fast. Updates are performed with very little overhead.
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It is very fast.
It will automatically clean-up old files.
Not bound to C/C++.
Tup supports writing build definitions using Lua or Tupfiles.
Pro Cross platform
Supports Linux, OSX, and Windows.
Con Variants not working on Windows
The solution for having different build configuration (think Release/Debug) is broken on Windows.
Con Cannot incrementally modify or delete files
Cannot incrementally modify files (e.g. LaTeX PDF, VISing and LIGHTing Quake maps, which takes the same BSP file as input and output), and will not delete files (e.g. rm build/*.o).