The list of 12 REST APIs:

  1. Alchemy -- alchemyapi.com/api/
  2. BestBuy -- bbyopen.com/developer/
  3. Bitly -- dev.bitly.com/api.html
  4. CharlieHarvey -- charlieharvey.org.uk/about/api/
  5. DropBox -- dropbox.com/developers/core/docs/
  6. Facebook -- developers.facebook.com/docs/graph-api/
  7. Musicgraph -- developer.musicgraph.com/api-docs/overview/
  8. Ohloh -- github.com/blackducksw/ohloh_api/
  9. TeamViewer -- integrate.teamviewer.com/en/develop/documentation/
  10. Twitter -- dev.twitter.com/docs/api/
  11. YouTube -- developers.google.com/youtube/v3/
  12. Zappos -- developer.zappos.com/docs/api-documentation/