[truebosko]

Build something that you wish you had, not what you think people need.

[clarry]

These tend to be the sort of things I'd already have if I knew how to build them, had enough time to build them, and/or could afford them :-(

[mosselman]

Solid advise. Any motivation to build something for others is soon gone, whereas you will keep working on that little library you want to use yourself.