I'm thinking knowing this can help build the community and customers, that ultimately invest in a platform we all seem to enjoy. Likes & reviews on these places could help.
I'll start, quite an easy one and common I'm sure: https://alternativeto.net/software/cloudron/
Previously tried Cloudways, Runcloud, D2C.io, all pretty good - but Cloudron just spoke to me for the low entry point for personal use, large variety of apps we already use and were setup with more complex K8S and multi-server/provider setups.
Just made complete sense to consolidate a lot of that and optimise for single-server setups with a more accessible admin interface that didn't require high-level dev-ops in-house for the more common needs of any open-source-first and privacy-conscious people or team.
I try to @mention Cloudron regularly on Twitter too on comments on other large open source account tweets for a bit more interest from those likely to find the same satisfying time-saving I'm here for.