There are approximately one thousand habit-tracking apps. Most of them want you to sign up, subscribe, sync to a server, and engage with a streak counter for gamification. Some of them are genuinely well-made. I've enjoyed more than a few in the past. But ...

I've always liked the idea of a bootable USB to house an install of Linux that I could just... bring to a random computer somewhere, start it up, and work on files on the go. Unfortunately people start to give you funny looks if you use an unrecognized OS ...