Web-based PPT (presentation) hosting system that facilitates sharing.
Online storage and sharing system for PowerPoint, PDF, Keynote and OpenDocument files. Presentations can have audio and video, be embedded in web pages and also comments are supported.
Chrome
Mentimeter
PollEverywhere
Pingo
Quizlet
Flashfox
Socrative
MyHomework
NearPod
On Webinar
Facebook
Google Sites
Wix
Linkedin
Google hangout
Schoology
Skype
Groupboard
Linoit
Twitter
Blogger
Wordpress
Dropbox
Google Drive
Pocket
Delicious
SplashTop Remote Desktop
Diigo
Splashtop Whiteboard
Netvibes
Piazza 
LiveBinder
Symbaloo
Pearltrees
Pinterest
Scoop.It
Prezi
Kindle
Blio
Quickoffice
Adobe Reader PDF
Scribd
Dragon Dictation
Evernote
Simplemind
WeVideo
Mobento
TED
i.nigma
Layar
Wikitude
Junaio
Aurasma
Geocaching
Mint
EarthViewer
Google Earth
Street View for Maps
History Pin
Zondle
WordBucket
Flashcards
50 Languages
Learn Languages with Busuu
English Level Test
Tellagami
Merriam-Webster Dictionary
English-Hungarian Dictionary
LectureNotes
CamScanner
Skitch
IFTTT
Explain EverythingES File Explorer File ManagerOneDrive