[mathieuh]

It goes further than just things developed by GDS themselves, all government projects for which GDS is responsible (i.e. they conduct audits and assessments at alpha, beta and live) are also open source. Here's one I worked on: https://github.com/dvsa/mot

Things generally don't have to be open source until you get to your beta assessment, as the alpha assessment is really just checking that you have a clear plan for getting to beta and they agree with your approach, so you don't fail for not being open source at this stage. The project I'm working on currently (an app to let companies wishing to perform road works see all road works being performed across the country, hopefully preventing things like two different companies digging up and resurfacing the road in a short space of time, etc.) is about to hit beta so will be open-sourced shortly