auth.nostr1.com or inbox.nostr.wine are a good place to start (the second one requires payment). If you want to self host, haven by nprofile1qy2hwumn8ghj7un9d3shjtn4w3ux7tn0dejj7qgnwaehxw309amk7apww468smewdahx2tcpz4mhxue69uhkvun9deejuat50phjummwv5hsqg8zenmu7gzq8ulj5jj4kv50ph3muwz43f747vmr9ld2alrjdswgavt99xv3 is really good