Giving the gift of a pull request to an open source project in need: 
On December 1st, 24 Pull Requests will be opening its virtual doors once again, asking you to give the gift of a pull request to an open source project in need. Six years ago, inspired by 24 Ways (an advent calendar for web geeks), I decided an advent calendar was a great way to motivate people to contribute to projects. Last year more than 16,000 pull requests were made by nearly 3,000 contributors through the site. And they’re not all by programmers.
read more: Opensource.com andrewnez
Supporting Open Source.
Have you tried: Diving with Sharks?