The Government Digital Service is a unit of the UK's Cabinet Office tasked with delivering digital by default. We have a practice of Coding In The Open, which means that a lot of public repositories end up on our GitHub account.
Alpha.gov.uk was the proof of concept that demonstrated that the GOV.UK project (and the Government Digital Service with it) could work. It was launched in May 2011 and remained live until the beta of GOV.UK launched at the end of January 2012. This GitHub account was set up for that project and then became the main account for the Government Digital Service.
As well as this account, we use the GDS attic GitHub account to store repositories that we've used but no longer maintain.
We create and maintain guidance on creating great digital government services.
GDS offers templates and styles to help government departments create services that fit the GOV.UK look and feel.
We built a set of tools to support the transition from DirectGov, BusinessLink and a host of other websites onto GOV.UK. You can read an overview of that in No Link Left Behind and Testing The Redirections.
The Performance Platform team creates dashboards to show the performance of government over time. We occasionally post on the Data at GDS blog.
We have a lot of code that shows up on displays around our office.