"Eschew flamebait. Don't introduce flamewar topics unless you have something genuinely new to say. Avoid unrelated controversies and generic tangents."
The most recent liberation of useful taxpayer funded software that I can think of was over ten years ago, when NIST released NFIS2 - the fingerprint software that the FBI relied on. They of course had to be crappy about it and wrap it in export controls that limited its utility, but it was interesting to see all the work that internal development had done - very polished, with man pages going back to '97. Ah the memories: software classified as munitions, the clipper chip...
[0] http://archive.adaic.com/pol-hist/policy/naig94-1.txt
[1] https://en.wikipedia.org/wiki/IDEF#The_IDEF_modeling_languag...
[2] https://en.wikipedia.org/wiki/MIL-STD-498
[3] https://web.archive.org/web/20041206072946/http://fingerprin...