CMake - CMake is an open-source, cross-platform family of tools designed to build, test and package software.
Captionfy.io - Captionfy is a free Youtube community captions platform with a subtitles/captions editor that you can use to create captions for any public Youtube video.
SCons - SCons is an Open Source software construction tool—that is, a next-generation build tool.
Amara - Amara
Ninja Build - Ninja is a small build system with a focus on speed.
NekoCap - Video & Movies