Now UI Kit - A beautiful Bootstrap 4 UI kit. Yours free.
Chat by Stream - Build and ship in app messaging in a few hours
UX Toolkit for Figma - Create beautiful user flow charts, sitemaps and wireframes
Mobile Chat Kit - UI kits & sample apps for building in-app mobile chat
Landing UI Kit - Handcrafted UI components for landing pages
iOS Design Kit - The newest library of native iOS templates