For a couple of projects I needed to read and write a couple of very large Excel and CSV files. I didn't find a good package that does this so I decided to create one myself. Under the hood it uses generators, so memory usage will remain low, even when working with large files.
After tweeting out a screenshot, it often get questions around which editor, font or color scheme I'm using. Instead of replying to those questions individually I've decided to just write down the settings and apps that I'm using.