For personal projects I write a lot of notes into .md files or comments but keep task lists as paper notes on letter pads. When the list gets too messy I copy the whole list by hand which means I keep on top of it. I'd argue that

https://en.wikipedia.org/wiki/CONWIP

is the basic practice of management for small projects and that you can't really commit to more work than you can handle with a paper process.

I have a whiteboard in my office and just put things there. The small size of the whiteboard forces brevity and the constant visibility makes it clear to me when I'm actually making progress on things and when they are lingering.

My personal projects are generally done by a team of 1 (sometimes I'll bring in one or two friends, but not usually). Project management for a team that small is trivial.

What I use to manage my personal projects is just a wiki and a version control system. Project management tools add some friction and overhead, so they're only useful if they're reducing more friction and overhead somewhere else. Working alone already greatly reduces such overhead, rendering heavier-duty tools counterproductive for me.

I prefer just doing it in Excel, Google docs, Google sheets and notes depending on complexity of the project.

The eradication of Project management and all it's concepts is an ideology I'm hoping to push, along with the elimination of all of their jobs (PMs/Scrum/Agile) along with their toy software. Just an army of one at the moment though.