Not specific to the quarantine, though I have been spending more time on it due to it: https://inko-lang.org/. It's a programming language I've been working on for the past few years.
In recent months I have been specifically working on making the compiler self-hosting. This has so far taken up more time than anticipated, as I had to rethink a lot of parts of the compiler (e.g. parts of the type system), and I didn't want to rush it.
With that said, progress is slowly improving as I'm making my way through implementing all the type checking rules. Hopefully in a few months the entire compiler is self-hosting.
In recent months I have been specifically working on making the compiler self-hosting. This has so far taken up more time than anticipated, as I had to rethink a lot of parts of the compiler (e.g. parts of the type system), and I didn't want to rush it.
With that said, progress is slowly improving as I'm making my way through implementing all the type checking rules. Hopefully in a few months the entire compiler is self-hosting.