Flarum - Flarum is the next-generation forum software that makes online discussion fun. It's simple, fast, and free.

WordPress - WordPress is web software you can use to create a beautiful website or blog. We like to say that WordPress is both free and priceless at the same time.

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!

DEV.to - Where software engineers connect, build their resumes, and grow.

Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.

Drupal - Drupal - the leading open-source CMS for ambitious digital experiences that reach your audience across multiple channels. Because we all have different needs, Drupal allows you to create a unique space in a world of cookie-cutter solutions.