The best alternatives to Flarum are Circle, On Deck Daily, and Discourse. If these 3 options don't work for you, we've listed a few more alternatives below.
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Circle is the world’s leading all-in-one platform for online communities. We make it possible for creators, coaches, educators, and businesses to bring together their audience with engaging discussions, live streams, events, chat, courses, and payments — all in one place, all under their own brand.
Discourse is an open source Internet forum and mailing list management software application founded in 2013 by Jeff Atwood, Robin Ward, and Sam Saffron.
Roundup is an Asynchronous Communication Tool that Saves Time, Reduces Burnout & Improves Transparency by giving your team space for written & meaningful conversations.
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.