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Open source serverless security lake platform on AWS
This is a brilliant idea! If you think the problem is bad in the US, you haven't stepped into spaces like Asia. This is a path that can help the world, not just EU/US scenarios. May I also suggest you consider the network layer centralization. When you mentioned Github+Stackoverflow, I got the point even before I visited your site. However, even as you think about an alternative on how we publish, consider that...
Robust and simple budgeting that works
Personally, at least among the apps I have used, no, I don't think any parts of existing apps are done well. I think there are a lot of existing applications which /do/ a lot, Mint, YNAB, EveryDollar, etc., etc. But the core budgeting/transaction aspect of them is always just the same thing, and instead of fleshing that particular aspect out, they branch out into investment management, credit building, loan/credit...
Hadith Nawawi is an Islamic Android App that is designed with the purpose to enlighten the heart and souls of Muslims around the globe with the authentic teachings of Prophet Muhammad (PBUH).
I have been using a solo WhatsApp group as my "notes app" for years. Quite common with Android users. But when I needed a dedicated notes app to get a little more organised, I couldn't find anything satisfactory. The popular notes app are way too complicated for my purpose. The lesser knowns usually don't have a good UI/UX. And there's also the issue of privacy. I needed a privacy respecting notes app which worked...