Openbazaar - A free online marketplace to buy and sell goods / services using Bitcoin. OpenBazaar is a peer-to-peer ecommerce platform with no fees or restrictions.
Vanilla Forums - Build an engaging community forum using Vanilla's modern cloud forum software.
Compound - Own a piece of the cities you love.
Forumbee - Forumbee offers community forums for discussions, feedback and Q&A.
Agora - A special place for your podcasts
Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.