Apps similar to Spirit (Forum) include Discourse, which is open source and free for personal use. Other options are Flarum, phpBB, Disqus and Simple Machines Forum. Forum Software like Spirit (Forum) are a crowded field, with more than 25 alternatives for self-hosting, the web, Linux, Windows and Mac.
Hosted comment platform with advanced AI spam filtering, threaded replies, emoji reactions, image uploads, and a robust moderation dashboard. Delivers privacy-first features like no tracking or ads, multiple sign-in options, and one-click import/export for easy migration.
United States
vBulletin (abbreviated as vB) is a commercial Internet forum software written in PHP using a MySQL database server.
United States
Invision Community is a flexible, feature-packed and easy to customize platform that powers some of the biggest and best communities on the web.
United States
WoltLab Suite (formerly Burning Board) is an enterprise grade CMS built for communities and forums.
Germany
EU
This is very much a WIP project, but the idea is that it will allow you to create and embed one (or more) guestbooks into your site!
Plush is the most polished, user-friendly forum experience ever, featuring real-time discussions, beautiful design, an integrated blog, member directory, private messaging, paid subscriptions and a world-class mobile experience.
United Kingdom
Forem is open source software for building modern and independent communities for your developers, peers, customers, users. Forem is already powering communities that serve over 10 million monthly unique visitors.
United States
ForumWP is the best forum plugin for WordPress. Use ForumWP to add a forum to your website and create an online community.
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.
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
HashOver is a PHP comment system intended as a replacement for services like Disqus. HashOver is free and open source software, under the GNU Affero General Public License. HashOver adds a "comment section" to any website, by placing a few simple lines of JavaScript or...
