I think Zed is quite different from Atom. But Pulsar might be your thing. A direct fork of the last release of Atom being developed by ex Atom developers :)
Just to clarify, the Pulsar devs aren't ex-Atom devs. Some of the team are from atom-community but none of the core Pulsar team were part of the official Atom team.
Watch this space for the full history, I'm literally putting the final touches on a blog post that will go into details of how Atom started then how it became Pulsar as a little celebration after we hit 3k stars.
This distinction is not as meaningful as it used to be before LSPs; there's little a PyCharm IDE can do that you can't do in VS Code editor for example.
The code for Zed itself is available under a copyleft license to ensure any improvements will benefit the entire community (GPL for the editor, AGPL for server-side components). GPUI, the UI framework that powers Zed, is distributed under the Apache 2 license, so that you can use it to build high-performance desktop applications and distribute them under any license you choose. https://zed.dev/blog/zed-is-now-open-source>