CMake - CMake is an open-source, cross-platform family of tools designed to build, test and package software.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
SCons - SCons is an Open Source software construction tool—that is, a next-generation build tool.
Drift - A messaging app that helps you grow your business.
Ninja Build - Ninja is a small build system with a focus on speed.
ChatSupport.co - ChatSupport is a live chat software for websites which lets you interact with website visitors and customers through customizable chat widgets.