Free Software Foundation and Scott G. Miller - SHA-512 implementation
Free Software Foundation and Paul Eggert - u64.h
Massachusetts Institute of Technology - install-sh
+Omnifarious, btel (StackOverflow uers) - Python argparse --[no-]foo options
Joachim Henkea - base91 specificaation and C implementation
Adrien BĂ©raud, Guillaume Jacquenot, SunDwarf aka eyesismine - base91 python