Crowdsourcing Providers

http://translatewiki.net/ Translation platform for open source projects

http://www.addic7ed.com/ Subtitle creation and translation for movies and TV shows

https://www.mturk.com/ Amazon's MTurk

http://www.samasource.org/

http://www.cloudcrowd.com/

http://www.shorttask.com/

http://www.microworkers.com/

http://www.mymicrojob.com/

http://www.clickworker.com/en/

http://www.datadiscoverers.com/

http://www.doloreslabs.com/ Crowdsourcing services and consulting

http://www.chaordix.com/ Crowdsourcing services and consulting

https://www.livework.com/ Misc

http://www.odesk.com/ Misc

http://www.liveops.com/ On-demand call center

http://castingwords.com/ Audio,video transcription

http://callgraph.biz/ Audio transcription

http://www.voices.com/ Voice acting

http://www.topcoder.com/ Coding contests

http://haystack.com/ Web design

http://www.spudaroo.com/ Copywriting and more

http://www.freshlybranded.com/ Marketing

http://www.solvate.com/

http://adhack.com/ Advertising/Creative services

http://www.fancyhands.com/ Personal assistants

https://getfriday.com/ Personal assistants

http://mygengo.com/

https://www.icanlocalize.com/

http://www.caterpi.com/ Translators

http://www.web-translations.com/

http://www.donanza.com/ Job aggregator

http://polylance.com

http://en.wikipedia.org/wiki/List_of_crowdsourcing_projects