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 Béraud, Guillaume Jacquenot, SunDwarf aka eyesismine - base91 python
"Omnifarious" and "btel" on Stackoverflow - python yes/no arg parsing
Joachim Henke - basE91 encoding format and the corresponding C library
Adrien Béraud, Guillaume Jacquenot, SunDwarf - python basE91 library
+Joey Hess - some elements of the Debian packaging