CMake - CMake is an open-source, cross-platform family of tools designed to build, test and package software.
SCons - SCons is an Open Source software construction tool—that is, a next-generation build tool.
Leiningen - Leiningen: automating Clojure projects
Ninja Build - Ninja is a small build system with a focus on speed.
SBT - SBT is a build tool for Scala, like Ant or Maven but with hieroglyphics.
Meson - Meson is an open source build system meant to be both extremely fast, and, even more importantly...