Nostrudel.ninja as a browser client
Gossip and Lume as deskstop clients
Nos.social and Nostur as iOS client
Amethyst as a Android client

noogle.lol
nostr.band

Try out different browser signing extensions like nostore, nos2x, flamingo, alby

highlighter.com
ccns.nostrver.se
nostrnests.com
Coracle.social
zap.stream 
snort.social