Donate pull requests for charity?

Some months ago, I saw an article on HN about an organisation which facilitated coders to contribute to software projects for charitiable organisations. It used some clever play on words, involving some github-related word (e.g. pull, fork), but I can't remember the name, and no amount of playing with HN's seach engine has yielded it for me. I have found a few similar organisations on the googles, but I want to track down this specific one. Can anyone help? Thanks.