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Pro Free and open source
NodeBB is free for all use cases, although the code is licensed under GPLv3, so the source code must be provided if you are re-distributing (and/or reselling) NodeBB.
Pro Plugin support
A selection of plugins for NodeBB are available.
Pro Has live chat
Private Messages (PMs) are live chats, just like messaging apps, allowing real-time conversations with one or a selection of users.
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Pro Modern & polished UI/UX with lots of great smaller features
The best feature is its design: discourse is designed to aid in the creation of high quality online conversations. Flat discussions with well implemented quoting systems, expandable/collapsible replies, infinite scroll, clean UI and many more features come together to form a highly polished forum...
Pro Has a built-in immune system from trolls, spammers and bad actors
Discourse has a simple user trust system that makes moderating the forum a lot easier. Users gain more permissions as they gain more trust, which limits the amount of damage spammers and trolls can do. Discourse co-founder Jeff Atwood also founded StackExchange, which is the gold standard for gami...
Con Complicated setup
Compared to standard PHP+MySQL apps, Discourse is more complicated - the app lives in a Docker container. However, a Docker image is available, which reduces the setup time to about 30 minutes.
Con No themes beyond changing colors
Discourse doesn't have a themes ecosystem. All you can do is change the colors.
Pro Extensible
XenForo is built to be the most extensible and flexible community software ever.
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Con Slow development
Development moves at a glacial pace.
Pro Free and open source
Vanilla is a free PHP+MySQL application that's licensed under GPLv2 with source code available on GitHub.
Pro Easy setup
Vanilla is a MySQL + PHP app and can be set up very easily.
Con No post edit history
Old versions of a post are only visible to admins, which may lead to a credibility problem. The amount of time during which users can edit their posts is configurable from a few minutes to indefinitely.
Con Poor search, unless using Sphinx
The default search that comes with Vanilla produces poor results because it uses MySQL. One needs to investigate integrating with Sphinx for much better results.
Pro Mobile friendly
AsmBB provides specially optimized skin for mobile browsers, resulting for best UX on any device.
Pro Real-time chat
Since v1.5 AsmBB includes real-time chat in order to allow instant communication between users for themes not suitable for the "message board" format.
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Pro Realtime
All updates in the forum happen real-time. No reloads required.
Pro Single Sign On (SSO)
Fruum can tie its user authentication with the authentication system of the hosting website, thus utilize the existing user base without requiring multiple sign-ups.
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Con No Self-hosted option
Muut uses a system similar to Disqus where your forum, comments etc. reside on their servers.
Con No post edit history
Posts can be edited for 2.7 minutes. After that, they remain fixed forever. This makes it impossible for the original post to be updated to reflect the current consensus, the latest version of a software being discussed etc.
Pro Open source
Source code is available on GitHub under GNU General Licence.
Con Outdated look and feel
Even the latest version of the software looks like the typical '90s forums which is now pretty outdated.
#10 
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Rizzoma
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