For my company, I needed a low-traffic Kanban board solution for cheap. Stood up on a small DO droplet and has been working well for a few days. It was my first time using Google Workspace's IdP and it mostly works without a hitch (though logout isn't supported, only way to logout is to clear site cookies and that is weird).

Total cost should be under $250/year, which is about 10X less than a SaaS for our use (free Trello is missing a lot of features that I'd like), and gives us more options besides. I plan to evaluate some of the additional apps for chat/video calls and docs, though I know this would increase the price for beefier infra, because Zoom, MS Teams either expensive for accounts or just damn buggy.