302 Useful APIs.
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Loading ...Google, Youtube, Amazon, del.icio.us, all the big names release APIs for development and interaction with their services. It can be daunting trying to break into the external API scripting arena of programming. Here is a very long list of 302 USeful APIs. Upon clicking on any of them, you will be taken to a page that lists all of the information about that individual API, along with a download link. Definitely worth checking out!
List:
| API | Description | Category | Mashups |
|---|---|---|---|
| Google Maps | Mapping services | Mapping | 1294 |
| Amazon eCommerce | Online retailer | Shopping | 214 |
| 411Sync | SMS, WAP, and email messaging | Messaging | 118 |
| Microsoft Virtual Earth | Mapping services | Mapping | 115 |
| Google Search | Search services | Search | 95 |
| Yahoo Search | Search services | Search | 93 |
| Technorati | Blog search services | Blog Search | 50 |
| Last.fm | Music playlist management | Music | 40 |
| Google Ajax Search | Web search components | Search | 38 |
| Yahoo Image Search | Image search services | Search | 36 |
| Amazon S3 | Online storage services | Storage | 29 |
| Google Calendar | Calendar service | Calendar | 26 |
| Google AdSense | Advertising management | Advertising | 25 |
| Windows Live Search | Internet search | Search | 25 |
| Upcoming.org | Collaborative event calendar | Events | 24 |
| geocoder | Geocoding services for US | Mapping | 23 |
| Yahoo Term Extraction | Contextual search service | Search | 21 |
| Trynt | Term extraction service | Other | 20 |
| BBC | Multimedia archive database | Media Management | 18 |
| Google Ajax Feeds | Access RSS and Atom feeds with JavaScript | Feeds | 17 |
| Yahoo Video Search | Video search | Video | 17 |
| Yahoo Traffic | Traffic data and routing | Other | 15 |
| Rhapsody | Online music services | Music | 14 |
| Blogger | Blogging services | Blogging | 13 |
| Google Desktop | Desktop search and gadgets | Search | 12 |
| Netvibes | Personalized home page with widgets | Widgets | 12 |
| HotOrNot | Dating rating site | Dating | 11 |
| ClearForest Semantic Web Services1 | Natural language processing tools | News | 10 |
| Zvents | Local events search and community | Events | 10 |
| Google Mashup Editor | Mashup creation tool extensions API | Tools | 9 |
| PayPal | Online payments | Payment | 9 |
| Yahoo Widgets | Desktop widgets | Widgets | 9 |
| Vast | Structured web search | Search | 8 |
| AOL Video | Video search service | Video | 7 |
| BigTribe | Location based advertising | Mapping | 7 |
| Findory | Personalized news aggregation | News | 7 |
| Google Custom Search | Google custom search management | Search | 7 |
| NOAA Weather Service | Weather forecast database | Weather | 7 |
| Poly9 FreeEarth | 3D mapping service | Mapping | 7 |
| SecondLife | Virtual world | Other | 7 |
| WeatherBug | Weather forecast services | Weather | 7 |
| Yahoo Travel | Online travel services | Travel | 7 |
| 23 | Photo sharing service | Photos | 6 |
| AOL Instant Messenger | Instant messaging chat service | Chat | 6 |
| Google Chart | Chart creation service | Other | 6 |
| Kayak | Travel search service | Travel | 6 |
| RapLeaf | Portable reputation system | Community | 6 |
| Alexa Web Search | Web Search Engine | Search | 5 |
| Google Checkout | Shopping cart services | Shopping | 5 |
| Ma.gnolia | Social bookmarking service | Bookmarks | 5 |
| Riya | Photo search | Photos | 5 |
| Windows Live Contacts Control | Contacts control | PIM | 5 |
| 30 Boxes | Calendar service | Calendar | 4 |
| Clickatell | SMS Messaging services | Messaging | 4 |
| FUTEF Wikipedia API | Third party Wikipedia web service | Reference | 4 |
| Google Talk | Chat application | Chat | 4 |
| Microsoft MapPoint | Mapping services | Mapping | 4 |
| Raw Sugar | Web directory service | Other | 4 |
| Smugmug | Photo sharing service | Photos | 4 |
| Sunlight Labs | US Congress database service | Government | 4 |
| US Postal Service | Package shipping and postage | Shipping | 4 |
| Windows Live Gadgets | Online gadgets service | Widgets | 4 |
| Yahoo Audio Search | Music search services | Media Search | 4 |
| Yelp | Local user reviews and city guides | Recommendations | 4 |
| Alexa Top Sites | Web site traffic rankings | Internet | 3 |
| Backpack | Online information manager | Office | 3 |
| Box.net | Online file storage | Storage | 3 |
| Compete | Internet web site metrics and analytics | Internet | 3 |
| Fotolia | Royalty free stock photos | Photos | 3 |
| Jaiku | Social messaging service | Messaging | 3 |
| Moreover | News delivery | News | 3 |
| Naver | Korean search engine | Search | 3 |
| NewsCloud | Social news service | News | 3 |
| Ning | Service creation playground | Other | 3 |
| Shadows | Social bookmarking and community | Bookmarks | 3 |
| SpringWidgets | Widget platform | Widgets | 3 |
| Windows Sidebar Gadgets | Desktop gadgets | Widgets | 3 |
| 43Things | Social goal setting | Other | 2 |
| Amazon Queue Service | Internet-based queuing service | Other | 2 |
| AOL Open Mail | Email services | 2 | |
| Blinksale | Online invoicing services | Financial | 2 |
| DataUnison eBay Research | eBay pricing and sales trend data | Shopping | 2 |
| EditGrid | Online spreadsheet | Office | 2 |
| Garmin MotionBased | GPS services and mapping | Mapping | 2 |
| GlobeXplorer | Mapping services | Mapping | 2 |
| InnerGears Weather by City | US Weather forecasts by city | Weather | 2 |
| LiveJournal | Blogging software | Blogging | 2 |
| Mobivity | SMS marketing messaging service | Messaging | 2 |
| NCBI Entrez | Life sciences search services | Medical | 2 |
| Pageflakes | Personalized start page and widgets | Widgets | 2 |
| Plaxo | Address book management | PIM | 2 |
| SeeqPod | Music recommendation service | Music | 2 |
| Snipshot | Online photo editing service | Photos | 2 |
| SpokenBuzz | Voice services portal | Telephony | 2 |
| StrikeIron Super Data Pack | APIs for variety of reference data sources | Reference | 2 |
| TagTooga | Tag based Internet directory | Tagging | 2 |
| Veoh | Virtual television and video network | Video | 2 |
| Weblogs | Blog ping service | Blogging | 2 |
| WebThumb | Thumbnail image generation service | Internet | 2 |
| Yahoo BBauth | Browser based authentication service | Security | 2 |
| Yahoo Site Explorer | Web site analysis service | Internet | 2 |
| Alexa Site Thumbnail | Thumbnail images of web site home pages | Internet | 1 |
| Authorize.Net | Internet based payment gateway services | Shopping | 1 |
| buySAFE | E-commerce trust network | Security | 1 |
| City and State by Zip Code | Address lookup service | Reference | 1 |
| Creative Commons | Licensing engine integration | Other | 1 |
| Daylife | Online News Service | News | 1 |
| deCarta | Location-based services | Mapping | 1 |
| EarthTools | Web services for geographical information | Mapping | 1 |
| eSideWalk | Community networking site | Other | 1 |
| FedSpending.org | Database of US government spending | Government | 1 |
| GetMapping | Aerial photography and mapping service | Mapping | 1 |
| Google Code Search | Code search service | Search | 1 |
| Google Safe Browsing | Security service to verify URLs | Security | 1 |
| Google Translate | Language translation service | Utility | 1 |
| Gruvr | Live music and concert information | Music | 1 |
| iGoogle Themes | Google homepage design service | Other | 1 |
| Internet Archive | Non-profit Internet library | Internet | 1 |
| Jots | Social bookmarking | Bookmarks | 1 |
| Kuler | Adobe web service for creating color themes | Other | 1 |
| Library of Congress SRW | Information database search | Reference | 1 |
| Living Stones | Bible lookup service | Other | 1 |
| MetaCarta | Location and geotagging services | Mapping | 1 |
| MyBlogLog | Social footprint sharing service | Community | 1 |
| NewsIsFree | Online news aggregation | News | 1 |
| Open Patent Services | European Patent Office web services | Government | 1 |
| OpenStreetMap | The Free Wiki World Map | Mapping | 1 |
| Pingdom | Web site monitoring and reporting services | Internet | 1 |
| PriceGrabber | Comparison shopping service | Shopping | 1 |
| Prodigem | File sharing via BitTorrent | File Sharing | 1 |
| PubSub | Blog and feed search | Blog Search | 1 |
| QuarkRank | Consumer reviews service | Shopping | 1 |
| Remember the Milk | Personal information management | PIM | 1 |
| Rrove | Social Bookmarking for Places Create & Share Maps | Bookmarks | 1 |
| Simpy | Social bookmarking | Bookmarks | 1 |
| SlideShare | Presentation sharing community | Office | 1 |
| stikkit | Little sticky notes that think | Utility | 1 |
| StrikeIron Tax Service | Sales tax reference lookup | Other | 1 |
| Tailrank | Blog search and news aggregation service | Blog Search | 1 |
| TheyWorkForYou | Track the UK Parliament | Government | 1 |
| Tunelog | Music metadata management | Music | 1 |
| Twittervision | Location based data for the Twitter service | Messaging | 1 |
| TypePad | Blog management | Blogging | 1 |
| US Yellow Pages | US yellow pages telephone directory | Reference | 1 |
| We Feel Fine | Art project that harvests feelings from blogs | Other | 1 |
| Where2GetIt SlippyMap | Online mapping service | Mapping | 1 |
| Windows Live Contacts | Contacts database | PIM | 1 |
| Windows Live Spaces Photo Control | Programmable widget for blog photos | Photos | 1 |
| Yahoo Search Marketing | Search advertising platform | Advertising | 1 |
| Zixxo | Online coupons | Shopping | 1 |
| ZoomIn | New Zealand mapping service | Mapping | 1 |
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