Using Views with a non-default data source

Here are some examples of data source plug-ins that Views can use as query back-ends.

• Apache Solr Views
• Elasticsearch Connector Views
• EntityFieldQuery Views Backend
• GBIF
• Google Analytics Reports
• oData
• Sarnia
• Socrata
• SPARQL Views
• Twitter Views Backend
• VARQL
• World Bank API
• Views XML Backend
• Views JSON Query
• YQL Views Query Backend

Any of these projects can be used as an additional baseline for creating additional query plugins. Please feel free to contribute a full tutorial on writing one!