Spending a lot of time at uni., I give some of this time, like pretty much every student, working on another projects.
It's generally small tools, softwares or data tinkerers made for fun, mostly to discover some new techs, but I recently started working on real projects.
These projects are small, easy and quick to develop. Why ? Because these are usually small "tools" aimed at fullfilling precise needs not met by other tools, in the simplest way I can manage to achieve. The goals while developing these tools are security, performance and size (of course, lighter is better).
They are all open-source, under non-restrictive licences.
You can find most of my projects in a few places: