Class

https://en.wikipedia.org/wiki/Classroom

https://www.google.com/search?q=outclass

Site
http://www.classteacher.com/

Online
http://www.onlineclasses.org/resources/

1

https://oneclass.com/

2
http://www.classroom20.com/

Collaborize
http://www.collaborizeclassroom.com/

Universal
https://www.universalclass.com/

Central
https://www.class-central.com/

Float
http://www.classafloat.com/

Start
http://www.startclass.com/

Master
https://www.masterclass.com

Noise
https://noisyclassroom.com/

Tube
https://www.youtube.com/results?search_query=class

Slides
http://www.slideshare.net/search/slideshow?searchfrom=header&q=class+room