Amethyst (render and melt)
NostrDVM (melt)
Nutz (Nip60/61in Python) and once Nutz is finished (and dependency stuff is fixed) NostrDVM will be able to receive pubkey bound cashu for DVM jobs.
Discussion
a whole category of nostr clients that render and can redeem ecash:
nostr:npub12vkcxr0luzwp8e673v29eqjhrr7p9vqq8asav85swaepclllj09sylpugg
nostr:npub1sn0rtcjcf543gj4wsg7fa59s700d5ztys5ctj0g69g2x6802npjqhjjtws
coracle
... (what else?)
Corny Chat can render cashu tokens. Users can copy to clipboard to facilitate whatever it is they want to do with the altcoins.