I use an app called Daylio as a diary and a mood tracker. It’s really good! I recommend it. 

I also use an app called Habit to track things I want to do every day, like “stay off social media” or “work on a project”.

I’ve been reading a lot about PICO-8 recently, and found it really interesting. For the uninitiated, PICO-8 is a ‘fantasy console’ - a games console which exists purely as a program and set of development tools, rather than a real piece of hardware. Developers can create games for PICO-8 which are small enough to be embedded directly into a .png image, which is really cool.