OpenSecrets.org: Money in Politics -- See Who's Giving & Who's Getting
OpenClass | Pearson
openHAB
Take a personality test - Open Source Psychometrics Project
오픈튜토리얼스
OpenCorpData: Online Corporate Business Database
Open Article Submission – Article Directory
OpenLearning: Teach and learn online for free
Home - Open Up Resources
Opennemas - CMS for Publishing Media Industry
People and Software that help you grow - Openprovider
Малый бизнес: бизнес-планы и руководства по открытию своего бизнеса
Opentip.com: Online shopping for promotional items, sporting goods, office products, home and garden, and apparel.
OpenGameArt.org
Open Hardware Monitor - Core temp, fan speed and voltages in a free software gadget
OpenApply - Your Online Admission System
OpenSim
OpenFOAM® - The Open Source Computational Fluid Dynamics (CFD) Toolbox
Home - OpenSearch
Home - Open Humans
Open Science Journals India | Indian Open Access Journal
Open Multiple URL – Open Multiple Links, Multi URL Opener, Bulk Links Opener, Too Many URL at once