I've built a simple personal wiki/blog at https://notes.wilfred.me.uk/. It has few features and little content, but it works.
I've tried to apply an agile philosophy: ship it ASAP. This is hard for side projects. I found the features I wanted after shipping changed considerably!
miniblog.
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I think you could build an interesting IDE with a tiny embedded LLM in addition to the usual tooling.
Features like 'extract method' would be much nicer if an LLM could provide a name. Choosing a good name is virtually impossible from just a typed AST.
For hobby projects, I really like software where I can do small features or tweaks. Sometimes I don't have time for anything more substantial.
Website projects are great for this. Are there other areas?
Today I learnt that Racket *intentionally* doesn't have a traditional REPL workflow. The authors were concerned about students not understanding the state between the current session and the code on disk.
(Arguably Jupyter has some of these features now.)