Museums and the machine-processable web / Cool stuff made with cultural heritage APIs

"There's of lot of behind-the-scenes work using linked data and cultural heritage APIs.  When data is open, as well as structured, people outside the organisation can make cool stuff.  Here's a selection of sites, apps and hacks that help demonstrate the value of linked open cultural data.  If you've made something cool or useful, don't be shy - add it to the list!"