Take a look on Forgejo: https://forgejo.org/
Can be self hosted and works quite well.
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GitHub repositories can also have "Discussions" which are separate from issues. There's also a project concept on GitHub. I think you could just use what GitHub already has built in.
Unfortunately, it’s for a private repository, so I can’t use GitHub.
Then use a dummy public repo. You don't get the nice integration. We used Mantis Bugtracker at work for quite some time but switched to Gitea (a selfhosted Github clone) and are trying to get our testers to use it more.
Also you should keep one thing in mind: needing an additional account, might stop people to use it. With Github I contribute for even smaller ideas. When I need to make an account first, I wont do it. Or when they want to use Discord. I do have Discord but come on...
Redmine? https://www.redmine.org/
Haven't use it personally tho
have used it, and its great. maybe it's a bit oldschool on first sight, but its a great, customizable project.
This looks pretty promising. It has everything I need. Thanks!