I've been using Marten for maybe 3 years now, and I absolutely love it! It's extensible too, so you can do just about anything with it - for example, I use it with views, multi tenancy, a base for aggregate queries and all sorts, and it works great.<p>The core team is really responsive on both GitHub and Gitter too, and are happy to both accept and help with PRs - it's (<i>almost</i>) the model of a well run OSS project.<p>One small thing tho... the original developer, Jeremy Miller, can be a bit... spiky; like you ask a question and he just <i>assumes</i> bad faith and will snark at you. I imagine this behaviour has put at least a few people off contributing and using Marten. I almost feel bad about mentioning this, because I'm a fan of his work, but OTOH I kind of hope Jeremy reads this comment and takes it constructively.