An introduction to querying linked data, using the SPARQL query language and the free knowledge base Wikidata.

You can find a lot of interesting, useful or amusing information on Wikidata – let’s spend half an hour writing some queries together!

Find out what kind of free services Wikimedia provides for you.

We will tell you how to serve a hundred thousand requests per second, for fun and non-profit

Find out what lies at the intersection of music and programming with this brief look at LilyPond, the free programmable musical typesetter!