[Collection] "Cloud" apps

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It might be helpful/interesting to compile apps that allow a "cloud" experience. With your responses, please list what category the app should go in, and a brief description.

What is a cloud app?
An application which enables you to perform some task from any location. This may be enabling functionality on devices that were not intended to have it (VOIP); or syncing info/files/etc across devices to allow you to access and manipulate them from anywhere (google music); or services that are platform agnostic, allowing access from anywhere (pandora).



File Sync

Dropbox - allows you to download/upload files to dropbox storage
Dropsync - live or scheduled sync app for dropbox. User selected folders will 2 way sync with a folder on dropbox and other devices. Use this to add cloud functionality to apps that don't have them (i.e. audible, save games, mind maps, etc)


Communication

Gmail - Seems standard at this point, but it is one of the original cloud apps. Allowing you to view, respond, and create emails from anywhere that sync with all your devices.
Google Voice - Call and text from pc, tablet or phone.
Groove IP - auxiliary app to call over wifi or data from tablets, phones, etc.
Skype - Chat, voice, video, and VOIP service on most devices
Google Talk - IM Service from google
Facebook Messenger - Facebook's native messenger that posts cross platform


Documents/Office
Google Docs - Edit, create, and collaborate on documents. Great on the PC, but yet to be user friendly on phones/tablets.
Cloud Print - Print documents from your phone/tablet


Financial
BofA - Make payments, transfers, or just check ballences (limited devices...)
Paypal - Make payments, transfers, or just check ballences
Mint - Establish financial plans, monitor charges, etc


Music
Google Music - Upload your library for access from anywhere.
Pandora - Streaming radio service. On pretty much every platform out there.
Gooveshark - Stream music from your computer
Spotify - Premium music streaming service


Video
Youtube - Stream videos from anywhere
Netflix - Stream Movies and TV shows from anywhere


Remote Desktop
Splashtop - Remotely control your PC from phone or tablet (requires HD version)
uTorrent Remote -Control your torrent downloads on your computer from your phone.


Location-based
My Tracks - Create routes and upload/download from google servers
Glympse - Share your location with friends, or your boss to proove you are stuck in traffic

Communication:
Facebook Messenger - Officiel messenger app for fb chat

Music:
Spotify - Music streaming service (requires premium account)

File/File sync:
Pogoplug
HiDrive

you might also want to set,what is US only.as these are US/UK only(that i 100% know of:
Google Voice
Google Music
Netflix

dont know about the rest.