Mobile Chat Kit - UI kits & sample apps for building in-app mobile chat
birb - birb — rentals browser, designed for London.
Ambient Design - Ambient is a mobile app design market where you can get unique mobile UI kits.
TurnUs Studio - Design agency on subscription. Designed, so you don't have to.
iOS Design Kit - The newest library of native iOS templates
Chat by Stream - Build and ship in app messaging in a few hours