Real apps and sites help demonstrate the value of open cultural data.

• Search the UK's CultureGrid by colour with CultureGridNE:colourAPP
• MuseumFinland - Finnish Museums on the Semantic Web. The site dates back to 2004, and information in English is available at http://www.seco.tkk.fi/applications/museumfinland/.They're also working on a Linked Data solution, more at http://www.seco.tkk.fi/projects/ldf/.

• It's worth keeping an eye on ResearchSpace, a project from the British Museum 'aimed at supporting collaborative internet research, information sharing and web applications for the cultural heritage scholarly community'.
• Results of The National Archives’ first hack day. Resources used include wartime Cabinet Papers, “Ancient Correspondence”, Medieval lenders and debtors, Olympic data...
• Cultural apps from the 'Apps for the Netherlands competition': http://www.opencultuurdata.nl/2012/01/apps4nl-overzicht-van-open-cultuur-data-demos/ (Google Translate version in English: http://translate.google.com/translate?sl=auto&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&u=www.opencultuurdata.nl%2F%3Fp%3D569&act=url).  There's a summary at http://openglam.org/2012/03/12/open-cultural-data-success-of-cultural-apps-in-the-apps-for-the-netherlands-competition/ "The app that went home with the overall gold prize was ‘Vistory‘, built and designed by Glimworm IT. Vistory combines history and videos from the Open Images dataset by using a smart phone’s geo-location technology. By freezing a frame, the user can recognize a location and take a photo using an overlay “reverse augmented reality” function of the app. When the picture is taken, the video is tagged with the exact geo-location. Also, the specific time signature on the video is tagged with the photo of how the scene looks, creating a “then and now” effect.".
• Brooklyn Museum has an Application Gallery published on our website that details each application as it's developed and where to find it.   You can also subscribe to our API News area via RSS and applications are annouced there as well.
• Brooklyn Museum also highlights more in-depth information about applications and interviews with Developers in the API tag of our blog and this tag is also availiable via RSS.
• Brooklyn Museum API: the iPhone app
• From their interview with the developer: "In my mind, there are few things that inspire people to learn like museums and the web do. ... Once I saw what the [Brooklyn Museum] API allowed, it seemed like an opportunity to create something that people would enjoy. The key to invention in this field is to build things that people don’t realize they will use.
• Because all the content is pulled from the API, it is a very lightweight app that will be convenient for users to update. When the iPhone 3.0 OS goes public in June, we are planning a much more exciting geotagging experience, because the built-in mapping is making a great leap forward. Also we are interested in allowing users to tag items in the collection, expand the browsing options, etc. The main point I want to emphasize is that this is only the beginning, and we are planning to expand the application as the API evolves."
• Brooklyn Museum API: Collections iPad App "Our collection data can now be found on the iPad courtesy of Wayne Bishop and his Art Collections app. ... 'Our application, named Art Collections, is a free app that allows users to browse art, photographs, antiques and other content from the museum.  The application provides access to over 25,000 pieces and was built specifically for the iPad (and iPad 2) because the large touchscreen allows users to scan, zoom, and touch the art.  The app is available in the iTunes App Store.'"
• DigitalNZ has a Widget Gallery where we publish apps made using the DigitalNZ API as well as widgets produced by end-users using the DigitalNZ customised search widget builder. The DigitalNZ API includes museums and cultural heritage institutions, as well as other content sources.
• Museum Pipes has some great examples of the possibilities available to non-programmers and a GUI interface.
• Museum Victoria (Australia) has discussed how they could use APIs for their community collections project, Collectish in this project blog post, World Collections: "The fundamental problem with trying to create a mashup with Museum collections is that there are very few that have exposed their collection database via an API or an OpenSearch feed. However quite a few have built some sort of mechanism to browse their collections online which means that we can query them indirectly using the Google API".
• Powerhouse Museum collection data was used in several of the Mashup Australia contest entries. Most notably one of the winning entires built a new in-gallery collection browser. More at http://www.powerhousemuseum.com/dmsblog/index.php/2010/11/11/quick-interview-with-amped-powerhouse-api-winners-andrea-lau-jack-zhao/.
• Powerhouse Museum data was also used for museum metadata games (more info at http://www.powerhousemuseum.com/dmsblog/index.php/2011/01/03/interview-with-mia-ridge-on-museum-metadata-games/) and for 'Mashificator' (more info at http://www.powerhousemuseum.com/dmsblog/index.php/2010/11/04/making-use-of-the-powerhouse-museum-api-interview-with-jeremy-ottevanger/).
• Science Museum, National Media Museum, National Railway Museum (UK) released collections data as CSV. Examples are being listed at http://sciencemuseumdiscovery.com/blogs/museumdev/
• A case study: Virtual Repatriation and the Application Programming Interface: From the Smithsonian Institution’s MacFarlane Collection to “Inuvialuit Living History” (Museums and the Web)
• From Sharing cultural heritage the linked open data way: why you should sign up: "Three apps made with cultural data won prizes. In the category Education, the Rijksmonumenten.info (http://rijksmonumenten.info/) mobile app by ab-c media (http://www.ab-c.nl/) containing (location-based) information on Holland’s 61,000 heritage sites won. ConnectedCollection (http://www.opencultuurdata.nl/?p=583) from Cit (http://www.go2cit.nl/) won an encouragement prize to further develop their tool that allows cultural institutions to add a button on their collection websites showing related objects from other heritage institutions when clicked. The app that went home with the overall gold prize was ‘Vistory‘ (http://www.vistory.nl/what-is-vistory.shtml), built and designed by Glimworm IT (http://www.glimworm.com/). Vistory combines history and videos from the Open Images dataset (http://www.opencultuurdata.nl/?incsub_wiki=nederlands-instituut-voor-bee...) provided by Sound and Vision by using a smart phone’s geo-location technology on a certain spot. By freezing a frame, the user can recognize a location and take a photo over it using a "reverse augmented reality" function with the app and the camera on a smart phone. When a picture is taken, the video is tagged with a geo-location so others can find it more easily. Also, the specific time signature on the video will be tagged with the photo of how the scene looks, creating a "then and now" effect. A demo of the Vistory app can be found at http://youtu.be/MXt4ExebHsA"