The best alternatives to Flarum Pro are GraphJS, InspiroBot, and Thredded. If these 3 options don't work for you, we've listed a few more alternatives below.
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Notion— Get over $6,000 worth of Notion + unlimited AI, for free
GraphJS is an open source set of “stickers” that enables social capabilities on any web page. It makes it easy decorating your site with social features like: * a powerful authentication infrastructure, * forum, * profiles, * groups * messaging * ratings, comments and more, as easy as adding an HTML tag such as:
InspiroBot is an artificial intelligence dedicated to generating unlimited amounts of unique inspirational quotes for endless enrichment of pointless human existence.
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 Ansible.
Pairagraph is a platform for written dialogue between notable individuals—politicians, CEOs, philosophers, technologists, religious leaders, and more. It's like Clubhouse, but for the written word.
Discord is great, we know it, but unfortunately it acts as a gateway for information openess. Great content is kept hidden from search engines and potential interested people. With ChannelSync you can create a public forum with your best conent of your server.