CMake - CMake is an open-source, cross-platform family of tools designed to build, test and package software.

Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.

GNU Make - GNU Make is a tool which controls the generation of executables and other non-source files of a program from the program's source files.

Solo - Personal kanban boards hosted on your own server

Leiningen - Leiningen: automating Clojure projects

Cash App - The easy way to send, spend, bank, and invest.