Telescopes Online

• Bradford Robotic Telescope - http://www.telescope.org
  
• Faulkes Telescope Project - http://www.faulkes-telescope.com
• National Schools' Observatory (for schools in UK or Ireland) - http://schoolsobservatory.org.uk
  
• Observing with NASA (OWN) - originally the MicroObservatory Robotic Telescope Network
• Skynet   http://skynet.unc.edu/
  
• Slooh - http://www.slooh.com - live only online observatories (Mount Teide in the Canary Islands). As of August 2017, Slooh has opened up a free tier of membership, which offers viewing and snapping images of all of live telescope feeds, reading the discussion board posts, and watching live shows. 
• See also paper by Edward L. Gomez, Michael T. Fitzgerald Robotic Telescopes in Education  - https://arxiv.org/pdf/1702.04835.pdf