The best alternative to Paint for me is Online
https://viliusle.github.io/miniPaint/
I don't know why it is called Mini, it's a very powerfull and complete editor. I use it as PWA, also selfhostable
Instead of Notepad
https://www.giuspen.net/cherrytree/
Calculator, curious, and complete this one
https://preccalc.sourceforge.net/
- arbitrary precision (up to 100,000,000 significant digits !!!)
- complex numbers
- fractions
- lists, vectors, matrices
- history (shortcuts ctrl+up, ctrl+down)
- calculator can write all results to a log file
- commands if, goto, print, return
- unlimited number of variables
- frequently used formulas can be saved as macros
- calculator can be translated to other languages