Atom was kinda revolutionary in its plugin support and everything IIRC.
Well, now that Atom has been replaced by VSCode, which is also an electron app, the original Atom devs, or at least some of them, are creating Zed. Zed's written in Rust and uses a lot less memory.
Of course it's not yet as mature and they're trying to earn money by integrating AI and selling that as a service. BUT the AI is voluntary and even if you do want to use it, you don't have to pay to use their AI (which comes with a free tier if you DO want to use it), you can literally run your own model in ollama.
It's not perfect, but I love how little RAM it uses compared to VSCode and (shudders) the Jetbrains suite (which I normally love, but hate the RAM and CPU usage, it can drive my computer pretty slow)