Discourse is not available for Linux but there are plenty of alternatives that runs on Linux with similar functionality. The best Linux alternative is phpBB, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Discourse and 12 are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Discourse are Simple Machines Forum, MyBB, vBulletin and WoltLab Suite.
Since its creation in 2000, phpBB™ has become the most widely used Open Source forum solution. Like its predecessors, phpBB™ 3.2 “Rhea” has an easy to use administration panel and a user friendly installation process, which allows you to have a forum set up in minutes.
Simple Machines Forum — SMF in short — is a free, professional grade software package that allows you to set up your own online community within minutes.
MyBB is the free and open source, intuitive, extensible, and incredibly powerful forum software you've been looking for.
vBulletin (abbreviated as vB) is a commercial Internet forum software written in PHP using a MySQL database server.
WoltLab Suite (formerly Burning Board) is an enterprise grade CMS built for communities and forums.
FluxBB is a fast, light, user-friendly forum application for your website. FluxBB was designed as a lighter, faster alternative to some of the traditional feature heavy forum applications. It is easy to use and has a proven track record of stability and security making it an...
YaBB is a free Perl forum (bulletin board) system that has rivaled professional message boards for years. YaBB provides chat for visitors where they can post any time and reply to anyone!.
Forum(s) built with JavaScript ( with CoffeeScript ) and alternativeto.net/software/json for the database distributed by the network .
PunBB is a fast and lightweight PHP-powered discussion board. It is released under the GNU General Public License.
AsmBB is high performance web forum software, written entirely in assembly language. It is very lightweight, but provides decent set of features and ultimate performance.
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ZeroTalk requires Zeronet to run, while anyone with an internect connection can connect to discourse.