Vim - I recently switched. The initial learning curve was really steep but once you get over it it's really great.
Notes.app
Obsidian - similar to Roam but with a free tier and with support for markdown.
Sticking to a single language on both frontend and backend if possible. We are using Typescript for both our server and frontend. One of the advantages is for example that everyone on the team can edit any code and fully implement features.
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Happy to answer any question folks. Feel free to ask!
My productivity stack: