CruiseControl is both a continuous integration tool and an extensible framework for creating a custom continuous build process.
boost.org: Boost.Build V2
An easy way to build C++ projects, everywhere.
scons.org: Scons: A Software Construction Tool
A make replacement like Cons, written in Python and featuring MD5 file signatures, dependency scanning, parallel build threads, viewpathing, multidirectory builds, and ...
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