I love testing wallets and Nostr clients, these are the ones I've tested so far:

Clients:

Damus.
Amethyst
Primal
Snort
Coracle
Freerse
Nos
Nostrudel
Highlighter
FreeFrom
Iris
0XChat
Openvibe
Plebstr

Wallets:
Wos
Alby
Speed
Muun
Zeus
Mutiny
ZBD
Bitcoli
Phoenix
Blue Wallet
Blink
Coinos
Enuts