Keybase has had a fraction of commits since purchase by Zoom
github.com
github.com
The current effort that seems to have some popularity is keyoxide[1]. Good folk, doing good work. It's also aggressive-of-the-aggressive-most copyleft, AGPL, which seems like a real sincere barrier to it becoming a bigger thing. But there's probably enough protocols & ideas here that an inter-operable re-implementation would work fine.