This is the first beta release of the Blockstream Green desktop app.
It is meant as a replacement for the GreenAddress app. The feature set has not been completely ported to the new app; subsequent releases are going to incrementally complete porting to the new app (such features are: fee bump for transactions, watch-only wallets, 2of3 accounts, Liquid Securities accounts for liquid and support for hardware wallets).
Reminder to users that this is beta software, use it with caution.