Apps similar to Flatboard include Discourse, which is open source and free for personal use. Other options are phpBB, Simple Machines Forum, MyBB and Vanilla Forum. You can choose from more than 10 Forum Software like Flatboard for self-hosting, Mac, Windows, Linux and the web.
Discourse is an open source discussion platform built for the next decade of the Internet. A modern forum, everything's been redesigned to be easy.
United States
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.
United Kingdom
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.
United States
MyBB is the free and open source, intuitive, extensible, and incredibly powerful forum software you've been looking for.
United Kingdom
Vanilla provides a standards-compliant, multi-lingual, theme-able and pluggablecommunity forum software that powers discussion forums on 800,000 sites.
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...
Feature-rich and lightning fast forums. Works standalone or as a Rails engine. Markdown by default, with plugins for code highlighting, KaTeX math, and BBCode. No JavaScript required. Easy deployment on Heroku or with Ansible.
uCoz is a free website-builder that includes hosting and a website management system. uCoz works according to the principles of Web 2.0 and allows creating of the most complicated projects with extraordinary simplicity and speed.
Russia
miniBB is a standalone, open source program for building your own Internet forum. If you want a lite, simple and stable message board attached to your existing website at the very high integration level, which may include the full customization of the layout to the look of your...
PunBB is a fast and lightweight PHP-powered discussion board. It is released under the GNU General Public License.
ElkArte is a modern, powerful community building forum software. It is completely free to use and is licensed with an open source BSD-3 clause license.
Kunena is the ideal forum extension for Joomla. It's free, fully integrated, and no bridges or hacks are required.
