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Looks similar to the open source lime text project. http://www.limetext.org/

Are they leveraging the same codebase in any way? How does Chime want to be different? I think lime is also written in go.

LimeText is still actively being developed here: Github: https://github.com/limetext

When they say Chime is a Go editor they don't mean it is written _in_ Go (although it could be), but that it is written _for editing_ Go.

Can confirm its written in go as well

I'm going to have to go ahead and disagree with you :) Developer here - there's Go in our backend systems, but not in the app, unfortunately.