I really like that you can self host an entire project management stack these days. For my co-op we use OpenProject for Issues / Kanban but it seems it has things like time tracking, wiki, and many other features we don't use because we prefer alternatives.
For wiki / notion we use Outline. For slack, Matrix. For CRM, Espo. For code repositories, forgejo, but we don't self host it, we use codeberg.
I think this stack would probably cost us a couple thousand of dollars a month if we paid for SaaS since we have around a hundred members. Instead we pay something like 30$/month for a couple hetzner servers through elestio.
When I work full time and I get to use all the bells and whistles SaaS products like linear, sometimes I think it's cool that the tool will do something like point out I'm about to create a duplicate ticket... But thousands of dollars a month cooler? Not sure, but not my money!