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I like to use Kate. It doesn't have the plethora of plugins, but it uses a fraction of the resources and has comparable built-in features.

If you want something more feature-rich with a plethora of plugins, then the IntelliJ Community Edition is under Apache-2.0. Still the corporate kind of open-source, but from a less immoral corporation.

(Neo)vim or Helix. The former for IDE.

I use VSCodium, which strips all the MS telemetry and junk from VSCode. I do find VSCode works fine as an editor, it's relatively light on resource usage and has lots of plugins for pretty much you need. I used to use IntelliJ, but I find it's just too much of a resource hog by comparison.