Obopay - Global mobile transaction solutions - VAS
Octopz - Collaborate on & in any file format - Productivity
Octora - Search & share feed bookmarks - RSS
Octoshape - Free live P2P audiocasting - Audio
Octro - Mobile instant messenger - Communicating
Oddflower - Share your bookmarks & feeds and get better search results - Search
Odeo - Record & share audio - Audio
Odesk* - Work as or hire remote workforce - Recruiting
Odinjobs - Job board for techies - Recruiting
Odiogo - Convert feeds to speech - RSS
Offermatica - Test & optimize your online marketing - Marketing
Offertrax - RSS-based shopping alerts - Ecommerce
Officezilla - Free collaboration solutions - Office
Ogle - Capture, re-use & print 3D data - Personal manufacturing
Ogog - Rate RSS-feeds & get extra voting power when your own posts are rated well - Publishing
Ohdontforget - Send yourself sms reminders - Office
Ohloh - Search indexed open source projects - Software
Ohmynews - International edition of biggest citizen journalism news site - News
Oihoi - First specify category, then search - Search
Okaytoplay - Tools & resources for podcasters & vloggers - About
OK-cancel - Collaboration on interface design - Design
Okcupid - Submit questions, define parameters & get matched for a date - Dating
Oks - Digg news - Rating
Ollo~ - Location based mobile dating - Dating
Omea - Manage & enhance your feeds - RSS
Omgili - Search discussion forums - Search
Omnidrive* - Store & access data - Storage
On2* - Video compression solutions - Software
On2go - News & alerts on your mobile - Dead, News
Ondergrond~ - Upload photos of public art - Photo
Onedump - Store & share - Storage
Onellama - Share your musical tastes & get recommendations - Audio
Onemonkey - Make some money on accepting text link advertising - Marketing
Onerandomsite - Add & share links & surf at random - Bookmarking
Onesens - Send teasing webmail messages - Communicating
Onestatement - Track your expenses - Finance
Onetruemedia - Mix & share videos, photos & music - Multimedia
Ongopongo - Search, create or submit & share maps - Geo
Onlinebookmarkmanager - Social bookmarking - Bookmarking
Onlinegroups - Create a site, a group, invite & collaborate - Productivity
Onlinephototool - Photo editor - Photo
Onlinewritingjobs - Gig directory for freelance writers - Economy
Only2clicks - Speed-dial startpage - Startpage
Onlyhuman - Share mistakes & get or give advice - Knowledge
Onlywire - Social bookmarking aggregator - Bookmarking
Onmycity - Upload, post & share everything locally - Community
Onnetworks - Watch & contribute to online how to-tv channels - Video
Ononemap - Find housing (map mash-up) (UK) - Geo
Onsofts - Ebay & Amazon combined shopping search - Ecommerce
Ontoplist - Claim your issue , customize & manage your toplist - List
Ontoworld - Semantic web wiki-community - Community
Onxiam - Aggregate your digital personae & find similar meta-profiles - Identity
Oodle - Find local classifieds - Search
Ookles - Upload & share photos - Photo
Oolsi - Share links to free things - Dead, Economy
Ooma - Free phone calls over landlines - Communicating
Oomia - Lost & found - Economy
Oondi~ - Publish & share your text - Publishing
Oos - Desktop OS - OS
Oovoo - Talk face-to-face over the web - Communicating
Oozm - Search refined by people - Search
Openacs - Content management system - Software
Openarchiteturenetwork~ - Share, review & collaborate on architectural projects - Community
Opencms - Content management system - Software
Opendiary - Publish your blog - Publishing
Openfire - Enterprise VoiP and chat solutions - Software
Openid - Distributed identity system - Identity
Openinhoud~ - Share links to and reviews of open source software - List
Openkapow - Mash-up editor & hosting - Software
Openlayers - Put a dynamic map on any web page - Software
Openmedianetwork - Multimedia epg - Multimedia
Openomy - Upload your files & use extra apps - Storage
Openpeople - Invite your friends & explore your network - Community
Openrico - Open source JS library - Software
Opensocialweb - Bill of rights for citizens of the sociosphere - About
Openstreetmap - View, edit & use geographical data - Geo
Openstudio - Create, collaborate, share, buy & sell - Economy
Openteams - Collaboration tools - Productivity
Openvlog - Upload & record video - Dead, Video
Openwave - Adaptive mobile suite for content, communications and context solutions - Software
Openwengo - Make free PC to PC video and voice calls over IP & communicate with your IM contacts - Communicating
Openwifispots - Search & connect to free wi-fi hotspots - Wi-fi
Operamini* - Mobile web browser - Browser
Operator11 - Create, edit, remix, view & share videos - Video
Opinionaggregator - Q&A - Knowledge
Opinity - Manage your reputation - Community
Opinmind - Connect opinions to people (bloggers) - Search
Opmlicons - OPML Icon project - RSS
Opmlloader - OPML reader Web based - RSS
Opmlmmanager - OPML reader Web based - RSS
Opmlsearch - Dedicated OPML search - Search
Opmlsurfer - Read OPML Web based - RSS
Opmlvalidator - OPML validator - RSS
Opmlworkstation - Edit, manage, convert & share OPML + PPT2OPML - RSS
Opmom - Community for mothers - Community
Opod - Ajax OPML & RSS widget - RSS
Opsdo - Hyper meta search - Dead, Search
Opsource - SaaS enablement and delivery platform - Software
Optevi - Get feeds & contextually relevant related news, blogs & discussion pages - News
Optimal - OPML widget - RSS
Optimost - Interactive marketing optimization solutions - Marketing
Opuzzvoice - Make money on doing voice overs - Economy
Orangoo - Spelling checker - Office
Orb - Personal portal - Startpage
Orbeon - Create Ajax forms - Design
Orbitfiles - Store, access & share files - Storage
Orbitz - Get rewards for submitting latest news on security wait times, traffic and parking, taxis, etc. at more than 40 airports - Publishing
Orca - Online personal desktop - Dead, OS
Orchestrate - Task manager - Productivity
Organizedwisdom - Publish & share your wisdom on health matters - Knowledge
Orgasms2~ - Share creativity & inspiration - Community
Orgoo - All your communications integrated in one dashboard - Communicating
Orgpluslive - Create & share org charts - Office
Orkut - Connect to your friends - Community
Oryanoo - Virtual office & CRM suite - CRM
Osviews - Submit & rate technology - Rating
Oszone - Share code - Software
Otavo - Collaborative web search - Search
Otherego - Profile aggregator - Identity
Ottobib - Create a bibliography by just submitting ISBN numbers - Data
Ourchart - Community for lesbians - Community
Ourmedia - Store & share data - Storage
Ourstage - Submit songs & video, let the users decide & win money prizes - Gaming
Ourstory - Tell & share the story of your life - Publishing
Outfoxed - Social search (now Lijit) - Dead, Search
Outorin - Gated community - Community
Outsidein - Explore what locals are saying about your (USA) neighborhood - Geo
Ovbb - Bulletin board solution - Software
Overratedunderrated - Rate & review media, and discuss your assessments - Rating
Ovosuite - Information, group calendar, file & collaboration management solution - Productivity
Ownskin - Create, explore & share mobile themes - Multimedia
Ownyourc* - Get help in making choices - Knowledge
Oyax - Social bookmarking - Bookmarking
Oyco - Meta communications toolkit - Communicating
Oyogi - Share Q&A - Knowledge
Oz - Mobile IM, email & social networking solutions - Software
Ozmozr - Import, store, share & manage feeds in bulk or individually - RSS
Octopz - Collaborate on & in any file format - Productivity
Octora - Search & share feed bookmarks - RSS
Octoshape - Free live P2P audiocasting - Audio
Octro - Mobile instant messenger - Communicating
Oddflower - Share your bookmarks & feeds and get better search results - Search
Odeo - Record & share audio - Audio
Odesk* - Work as or hire remote workforce - Recruiting
Odinjobs - Job board for techies - Recruiting
Odiogo - Convert feeds to speech - RSS
Offermatica - Test & optimize your online marketing - Marketing
Offertrax - RSS-based shopping alerts - Ecommerce
Officezilla - Free collaboration solutions - Office
Ogle - Capture, re-use & print 3D data - Personal manufacturing
Ogog - Rate RSS-feeds & get extra voting power when your own posts are rated well - Publishing
Ohdontforget - Send yourself sms reminders - Office
Ohloh - Search indexed open source projects - Software
Ohmynews - International edition of biggest citizen journalism news site - News
Oihoi - First specify category, then search - Search
Okaytoplay - Tools & resources for podcasters & vloggers - About
OK-cancel - Collaboration on interface design - Design
Okcupid - Submit questions, define parameters & get matched for a date - Dating
Oks - Digg news - Rating
Ollo~ - Location based mobile dating - Dating
Omea - Manage & enhance your feeds - RSS
Omgili - Search discussion forums - Search
Omnidrive* - Store & access data - Storage
On2* - Video compression solutions - Software
On2go - News & alerts on your mobile - Dead, News
Ondergrond~ - Upload photos of public art - Photo
Onedump - Store & share - Storage
Onellama - Share your musical tastes & get recommendations - Audio
Onemonkey - Make some money on accepting text link advertising - Marketing
Onerandomsite - Add & share links & surf at random - Bookmarking
Onesens - Send teasing webmail messages - Communicating
Onestatement - Track your expenses - Finance
Onetruemedia - Mix & share videos, photos & music - Multimedia
Ongopongo - Search, create or submit & share maps - Geo
Onlinebookmarkmanager - Social bookmarking - Bookmarking
Onlinegroups - Create a site, a group, invite & collaborate - Productivity
Onlinephototool - Photo editor - Photo
Onlinewritingjobs - Gig directory for freelance writers - Economy
Only2clicks - Speed-dial startpage - Startpage
Onlyhuman - Share mistakes & get or give advice - Knowledge
Onlywire - Social bookmarking aggregator - Bookmarking
Onmycity - Upload, post & share everything locally - Community
Onnetworks - Watch & contribute to online how to-tv channels - Video
Ononemap - Find housing (map mash-up) (UK) - Geo
Onsofts - Ebay & Amazon combined shopping search - Ecommerce
Ontoplist - Claim your issue , customize & manage your toplist - List
Ontoworld - Semantic web wiki-community - Community
Onxiam - Aggregate your digital personae & find similar meta-profiles - Identity
Oodle - Find local classifieds - Search
Ookles - Upload & share photos - Photo
Oolsi - Share links to free things - Dead, Economy
Ooma - Free phone calls over landlines - Communicating
Oomia - Lost & found - Economy
Oondi~ - Publish & share your text - Publishing
Oos - Desktop OS - OS
Oovoo - Talk face-to-face over the web - Communicating
Oozm - Search refined by people - Search
Openacs - Content management system - Software
Openarchiteturenetwork~ - Share, review & collaborate on architectural projects - Community
Opencms - Content management system - Software
Opendiary - Publish your blog - Publishing
Openfire - Enterprise VoiP and chat solutions - Software
Openid - Distributed identity system - Identity
Openinhoud~ - Share links to and reviews of open source software - List
Openkapow - Mash-up editor & hosting - Software
Openlayers - Put a dynamic map on any web page - Software
Openmedianetwork - Multimedia epg - Multimedia
Openomy - Upload your files & use extra apps - Storage
Openpeople - Invite your friends & explore your network - Community
Openrico - Open source JS library - Software
Opensocialweb - Bill of rights for citizens of the sociosphere - About
Openstreetmap - View, edit & use geographical data - Geo
Openstudio - Create, collaborate, share, buy & sell - Economy
Openteams - Collaboration tools - Productivity
Openvlog - Upload & record video - Dead, Video
Openwave - Adaptive mobile suite for content, communications and context solutions - Software
Openwengo - Make free PC to PC video and voice calls over IP & communicate with your IM contacts - Communicating
Openwifispots - Search & connect to free wi-fi hotspots - Wi-fi
Operamini* - Mobile web browser - Browser
Operator11 - Create, edit, remix, view & share videos - Video
Opinionaggregator - Q&A - Knowledge
Opinity - Manage your reputation - Community
Opinmind - Connect opinions to people (bloggers) - Search
Opmlicons - OPML Icon project - RSS
Opmlloader - OPML reader Web based - RSS
Opmlmmanager - OPML reader Web based - RSS
Opmlsearch - Dedicated OPML search - Search
Opmlsurfer - Read OPML Web based - RSS
Opmlvalidator - OPML validator - RSS
Opmlworkstation - Edit, manage, convert & share OPML + PPT2OPML - RSS
Opmom - Community for mothers - Community
Opod - Ajax OPML & RSS widget - RSS
Opsdo - Hyper meta search - Dead, Search
Opsource - SaaS enablement and delivery platform - Software
Optevi - Get feeds & contextually relevant related news, blogs & discussion pages - News
Optimal - OPML widget - RSS
Optimost - Interactive marketing optimization solutions - Marketing
Opuzzvoice - Make money on doing voice overs - Economy
Orangoo - Spelling checker - Office
Orb - Personal portal - Startpage
Orbeon - Create Ajax forms - Design
Orbitfiles - Store, access & share files - Storage
Orbitz - Get rewards for submitting latest news on security wait times, traffic and parking, taxis, etc. at more than 40 airports - Publishing
Orca - Online personal desktop - Dead, OS
Orchestrate - Task manager - Productivity
Organizedwisdom - Publish & share your wisdom on health matters - Knowledge
Orgasms2~ - Share creativity & inspiration - Community
Orgoo - All your communications integrated in one dashboard - Communicating
Orgpluslive - Create & share org charts - Office
Orkut - Connect to your friends - Community
Oryanoo - Virtual office & CRM suite - CRM
Osviews - Submit & rate technology - Rating
Oszone - Share code - Software
Otavo - Collaborative web search - Search
Otherego - Profile aggregator - Identity
Ottobib - Create a bibliography by just submitting ISBN numbers - Data
Ourchart - Community for lesbians - Community
Ourmedia - Store & share data - Storage
Ourstage - Submit songs & video, let the users decide & win money prizes - Gaming
Ourstory - Tell & share the story of your life - Publishing
Outfoxed - Social search (now Lijit) - Dead, Search
Outorin - Gated community - Community
Outsidein - Explore what locals are saying about your (USA) neighborhood - Geo
Ovbb - Bulletin board solution - Software
Overratedunderrated - Rate & review media, and discuss your assessments - Rating
Ovosuite - Information, group calendar, file & collaboration management solution - Productivity
Ownskin - Create, explore & share mobile themes - Multimedia
Ownyourc* - Get help in making choices - Knowledge
Oyax - Social bookmarking - Bookmarking
Oyco - Meta communications toolkit - Communicating
Oyogi - Share Q&A - Knowledge
Oz - Mobile IM, email & social networking solutions - Software
Ozmozr - Import, store, share & manage feeds in bulk or individually - RSS
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