Planner in LaTeX
Yeah, I know—that's not a great title. But it benefits from accuracy.
Anyway, I've never been able to find a proper planner that works for me and that tracks the things I want to and need to track. I've played around over the years with creating one on my own, but have never come up with anything satisfactory.
I finally decided the best way to do this would be in LaTeX, because it does a great job with page layout. The only problem was that I didn't know LaTeX. That took a weekend to solve, and here we are. It's not pretty (and it's certainly not complete) but it is functional, and that's what matters right now.