Haven't really seem much exciting built around fedimint in a while. Not since Mutiny Wallet was using it for offline receiving. Meanwhile, nostr:nprofile1qqs9pk20ctv9srrg9vr354p03v0rrgsqkpggh2u45va77zz4mu5p6ccpzemhxue69uhk2er9dchxummnw3ezumrpdejz7qgkwaehxw309a5xjum59ehx7um5wghxcctwvshszrnhwden5te0dehhxtnvdakz7qrxnfk and others have been busting their ass builting cool stuff with Cashu.

No reason defining couldn't integrate a lot of what they've been doing, but haven't seen much movement there. They seem more focused on community custody for underserved regions, which has limited cross-over application to Nostr.