opened its Open Data Portal some days ago.
Powered by CKAN.
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Most of the 5811 datasets (97%) are statistical ones provided by Eurostat.
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‘Top Publishers
Eurostat (5634 datasets)
European Environment Agency (106 datasets)
Joint Research Centre (37 datasets)
Directorate-General for Health and Consumers (12 datasets)
Publications Office (11 datasets)
Directorate-General for Education and Culture (3 datasets)
Directorate-General for Communications Networks, Content and Technology (2 datasets)
Directorate-General for Employment, Social Affairs and Inclusion (1 datasets)
Directorate-General for Enterprise and Industry (1 datasets)
Directorate-General for Regional and Urban Policy (1 datasets)‘.

Linked Open Data are provided

An important step! ‘The European Commission Open Data Portal is well aligned with the initiatives of linked data and semantic web technologies. The dataset metadata is available as triples on triple store and attached to the dataset records.’

One App for the moment…

… but an interesting one creating visualisations based on RDF input, with javascript based output (Highcharts charting library).
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cubevizExample
‘CubeViz is a facetted browser for statistical data utilizing the RDF Data Cube vocabulary which is the state-of-the-art in representing statistical data in RDF. This vocabulary is compatible with SDMX and increasingly being adopted.’