Flarum - Flarum is the next-generation forum software that makes online discussion fun. It's simple, fast, and free.
Medium - Welcome to Medium, a place to read, write, and interact with the stories that matter most to you.
Simple Machines Forum - Simple Machines offers free open source software such as SMF, the powerful and easy to use community forum written in PHP. Start interesting discussions on your website!
Pressmo - Page Flip software that allow You to convert PDF files into digital magazines, page flip books, digital brochures, interactive catalogs and photo albums. Off-line (USB or CD) and on-line.
Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.
OverBlog - OverBlog is a blogging platform, active and evolving.