The dhall survey has a ton of interesting feedback from users about why they use the language, what they use it for, and areas that need work. https://www.haskellforall.com/2020/02/dhall-survey-results-2019-2020.html
It's a really great way of learning what needs polish on the official website too!
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I've added an eval button to the website of my programming language!
It's a been a lot of work to lock down appropriately. It still needs some UI polish but it's so nice to be able to try snippets immediately.
https://www.garden-lang.org/
Ooh, difftastic is now listed on the official git website! https://git-scm.com/tools/command-line
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?