No, I hadn't heard of COSS! Thanks for that - reading up on it now. Seems like exactly the framework I'm thinking about.

I love the Cal.com story. What gives me some pause is that they're VC-backed. $25M Series A. The free tier might be great, and I might come to rely upon it. But they're expected to produce an outsized ROI, and the traditional SaaS play is to give it away for free to capture the market and then raise prices. I'd much prefer a community-driven effort where we have no ROI expectations, so it can remain low-cost forever as we're just splitting overhead.