Pressbooks - Create books: print and ebooks
vBulletin - Build a community website with the leading forum software, vBulletin 5 Connect, or in the cloud on vB Cloud!
Meminto Stories - Meminto Stories makes it easy for anyone to become the author of their own book.
Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.
Time Capsule - Transform your 2020 into a tiny, personalized book for free!
XenForo - Intuitive. Social. Engaging. Fast. XenForo brings a fresh outlook to forum software.