I wrote a few apps when I realized that I couldn't find anything ready-to-use for my tasks.

For example:

Conversion between .env and .json configs: https://github.com/magicxor/EnvJsonConv

Web scraping different platforms and sending results to my favorite messenger: https://github.com/magicxor/ExtensibleMessageBroker

Transformation of copied text using regular expressions: https://github.com/magicxor/ClipboardTransform

It usually takes 3-10 days to implement and polish the core functionality. Some apps I use on a daily basis (e.g., bots in my favorite messenger), and some 1-2 times per month.