I’m looking to appreciate “retro” Haskell projects,
If "retro" = "old", then look at this from 1997 https://github.com/jwaldmann/rx (state at first commit) And, I second what others have suggested: Paul Hudak: Haskore, https://web.archive.org/web/19970206084830/http://haskell.cs.yale.edu:80/has... Peter Thiemann: Wash, http://www2.informatik.uni-freiburg.de/~thiemann/haskell/WASH/ The pinnacle of Haskell retrocomputing certainly is https://downloads.haskell.org/~ghc/0.29/
... things from before stabilization/company use.
Haskell(98,2010) does have stability: language and core libraries adhere to the report. It's the companies that are destroying it :-) But you're right, they also spend effort on stabilization. When I cabalized my project in/around 2014, I was pleasantly surprised how little change it needed. Basically, just build-depend: haskell98. Don't read the actual source too closely - it's full of Lists and Ints, because, well .. little did I know at the time. On the other hand: naive means of expression, combined with absence, or ignorance, of libraries - makes future-proof software. Will you tell us the results of your appreciations? Are you "just" collecting sources? (already that is worthwhile) Compiling them? Running? Benchmarking? Writing a paper? I'd love to read that. - J.W.