"Does it work with entity framework?" -> It works with whatever .NET db tool you want to use, it's entirely agnostic in this regard.
"OWIN?" -> It can, with WebSharper.WebAPI [1].
"What's the story with the F# to javascript compilation; did they invent that or is it another project?" -> It's an in-house developed compiler.
"Who are these people?" -> A Hungarian company called IntelliFactory.
(full disclosure, I work at IntelliFactory.)
Perhaps worth mentioning, I recently saw a presenter say his company is moving away from Entity Framework in favor of F# type providers.
Agree on FOSS. It's nice this company will license to me for opensource projects, but what happens if they go out of business?
Has anyone used this that can provide some insight into it? Does it work with entity framework? OWIN? What's the story with the F# to javascript compilation; did they invent that or is it another project? Who are these people?
I think it's a shame that the C#/.NET ecosystem can't seem to have FOSS nice things because it really hampers stuff gaining traction. However I find the open source license for this is very clear and generous; I still can't seem to figure out if ServiceStack is safe to use :| This should allow for learning the framework and providing nice things to the community, and then the licensing seems reasonable compared to the value proposition for working on commercial software.