There' s the ESA Summer of Code for students, but if you are no longer a student and still wanted to do space related coding - watch out for the Hackathon at the Satellite Applications Catapult which is now open for registration. The dates are 28-29 June, 2014.
And there's nothing more exciting than the first ever SpaceUp unconference in the UK on 5-6 July, 2014 - get your early bird ticket for 25GBP before the 25 May. If you are unfamiliar with unconference, here is what wiki said: "Typically at an unconference, the agenda is created by the attendees at the beginning of the meeting. Anyone who wants to initiate a discussion on a topic can claim a time and a space. Unconferences typically feature open discussions rather than having a single speaker at the front of the room giving a talk, although any format is permitted." - but don't worry, keep an eye on the SpaceUp UK site, it will be releasing more tips and information in the run up to the day, so watch this space - just save the date and get the tickets already! Come to tell and hear about space at SpaceUp UK.