Simple templates for writing articles, short stories, screenplays. Most of them uses some packages that removes the slightly 'essay-like' formatting of the book-style for instance. I also got an invoice-template for freelancers with support for VAT.
A python script that calculates compound interest on investments.
A little simple shell script where you can set how much you own of which cryptocurrency. Then, when you run the script, it fetches the current price (from rate.sx) in your currency of choice and prints it out.
Scripts I've found, or found and edited or simply written myself.