Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
Now UI Kit - A beautiful Bootstrap 4 UI kit. Yours free.
Bigtent - BigTent is a web-based organization and communication portal for groups.
Bots UI Kit - Fully customizable Sketch UI Kit for Messenger Platform
Nabble - Nabble is a forum software that are embeddable and fully customizable with scripting language.
Landing UI Kit - Handcrafted UI components for landing pages