Wire open-sourced back-end services
github.comhttps://medium.com/wire-news/open-sourcing-wire-server-code-... if you're looking for the announcement
Their choice of license is great; the real free software license which can keep its freedom and openness.
A chance to read some production Haskell -- maybe not a great good, but clearly a good.
Note that the license is AGPL.