APIs by Category in http://www.programmableweb.com/a
Advertising (14)
Events (10)
Music (38)
Security (21)
Answers (5)
Fax (2)
News (15)
Shipping (8)
Auctions (2)
Feeds (12)
Office (13)
Shopping (43)
Blog Search (7)
File Sharing (6)
Other (80)
Sports (9)
Blogging (18)
Financial (53)
Other Search (1)
Storage (15)
Bookmarks (15)
Food (3)
Payment (7)
Tagging (8)
Calendar (4)
Games (15)
Photos (38)
Telephony (35)
Catalog (1)
Government (22)
PIM (7)
Tools (9)
Chat (11)
Internet (66)
Politics (3)
Travel (18)
Community (55)
Job Search (8)
Project Management (17)
Utility (11)
Database (8)
Mapping (76)
Real Estate (10)
Video (42)
Dating (1)
Media Management (7)
Recommendations (19)
Weather (4)

Email (27)
Media Search (1)
Reference (57)
Widgets (17)
Enterprise (31)
Medical (13)
Search (36)
Wiki (9)
Events (10)

rammableweb.com/apis 1125 APIs

http://carrero.es/lista-completa-de-apis-web-20/1012
Advertising
Google AdSense
Google AdWords
Microsoft adCenter
UrlTrends
Wordtracker
Yahoo Ads
Yahoo Search Marketing
Answerbag
Blogwise
SplogSpot
Blog Search
Blogwise
SplogSpot
Tailrank
Technorati
Blogging
Akismet
Blogger
FeedBlitz
FeedBurner
LiveJournal
Performancing
TypePad
Weblogs
Windows Live Spaces
Bookmarks
Blogmarks
del.icio.us
linkaGoGo
Ma.gnolia
OnlyWire

Shadows
Simpy
Calendar
30 Boxes
Google Calendar
Spongecell
Chat
AOL Instant Messenger
AOL Presence
Google Talk
IMified
Lingr
MSN Messenger
WebAIM
Yahoo Messenger
Community
Blue Dot
coRank
Facebook
PartySpark
RockYou Super Wall
Twitter
Email
Email Address Validator
ExactTarget
IntelliContact
JangoMail
Mailbuild
Publicaster
StrikeIron Email Verification
Vertical Response
Webmail.us
WhatCounts
Yahoo Mail

Enterprise
Employease
Google Provisioning
Lokad
NetDocuments
NetSuite
Salesforce.com
WebEx
Events
Eventfinder
Eventful
Spraci
Upcoming.org
Zvents
Financial
Blinksale
Currency Rates
Dun and Bradstreet Credit Check
FreshBooks
KashFlow
Moneytrackin
NetAccounts
Prosper
StrikeIron Historical Stock Quotes
StrikeIron Mutual Funds
StrikeIron Stock Quotes Basic
Wesabe
Government
Cicero
Civic Footprint
Democracy In Action
FedSpending.org
Follow The Money
GovTracker
LOUIS
Open Patent Services

Sunlight Labs
TheyWorkForYou
Who is my Representative
Internet
Alexa Site Thumbnail
Alexa Top Sites
Amazon EC2
Clicky
Compete
Cordurl
Dapper
Domain Tools
Durl.us
Ecommstats
Hostip.info
HTML2PDF
Internet Archive
IP Address Lookup
Mint
Mon.itor.us
MyNotify
Nenest
Outune
Pingdom
Qurl
SoftLayer
UnAPI
W3Counter
Webride
WebThumb
Windows Live Custom Domains
Yahoo Site Explorer
Job Search
Indeed
SmashFly
Mapping
ArcWeb

BigTribe
deCarta
EarthTools
FeedMap
Garmin MotionBased
geocoder
geocoder.ca
GeoIQ
GeoNames
GetMapping
GlobeXplorer
Google Maps
HopStop
iShareMaps On Demand
Map24 AJAX API
Mappr
MapQuest
Mapstraction
MetaCarta
Microsoft MapPoint
Microsoft Virtual Earth
Multimap
NASA
Naver Maps
Nearby.org.uk
Ontok
OpenLayers
OpenStreetMap
Platial
Plazes
Poly9 FreeEarth
Pushpin
Urban Mapping
USGS Elevation Query Service
ViaMichelin
Wayfaring
WHERE GPS
Where Is Tim Web Service
Where2GetIt Geospatial
Where2GetIt SlippyMap
Whereis
Wigle
Yahoo Geocoding

Yahoo Map Image
Yahoo Maps
ZeeMaps
ZoomIn
Media Management
BBC
Grouper Video
Orb
Phanfare
Streamload
Medical
cPath
Kegg
NCBI Entrez
SeqHound
Messaging
411Sync
Aql
Clickatell
Jaiku
Mobivity
Movil
PartySync
Sabifoo
SmsBug
StrikeIron Global SMS Pro
StrikeIron Mobile Email
Textamerica
Trekmail
Twittervision
Userplane
Vazu
Music
AOL Music Now
Digital Podcast

Faces.com
Feedcache
Freedb / CDDB
Last.fm
MP3Tunes
MusicBrainz
MusicDNS.org
MusicMobs
OpenStrands
Rhapsody
SeeqPod
SNOCAP
Soundtoys
Tunelog
WebJay
Winamp
Yahoo Music Engine
News
AmphetaRate
ClearForest Semantic Web Services1
Daylife
Digg
Findory
Macromedia News Aggregator
Moreover
NewsCloud
NewsIsFree
Office
Backpack
Big Contacts
EditGrid
Google Documents List
Google Spreadsheets
Numbler
SlideShare
Zoho
Photos

AOL Pictures
Buzznet
Flickr
Fotolia
Google Picasa
imageLoop
Panoramio
Pixagogo
Riya
ShutterPoint
Smugmug
Snipshot
WebShots
Yahoo Photos
Zoto
Recommendations
Criteo
EasyUtil
RapLeaf
Yelp
Reference
Aonaware Dictionary
City and State by Zip Code
Dun and Bradstreet
Bussines Verification
FUTEF Wikipedia API
ISBNdb
Library of Congress SRW
Microsoft MSDN
OpenDOAR
PhoneVal
RealEDA Reverse Phone Lookup
SRC Demographics
StrikeIron Address Verfication
StrikeIron Do Not Call
StrikeIron Insider Trading
StrikeIron Phone Number Enhancement
StrikeIron Residential Lookup
StrikeIron Reverse Phone Lookup

StrikeIron Sales Tax Basic
StrikeIron Super Data Pack
StrikeIron US Census
StrikeIron Zacks Company Profile
Talis
UrbanDictionary
US Yellow Pages
Yahoo Answers
Search
Alexa Web Information Service
Alexa Web Search
Amazon A9 OpenSearch
Gigablast
Google Ajax Search
Google Code Search
Google Desktop
Google Search
Kratia
Naver
Vast
Windows Live Search
Wink
Yahoo Image Search
Yahoo Local Search
Yahoo My Web Search
Yahoo Related Suggestions
Yahoo Search
Yahoo Term Extraction
AOL Open Auth
Shopping
Amazon eCommerce
Amazon Historical Pricing
Authorize.Net
AvantLink
CNET
Commission Junction
DataUnison eBay Research
Direct Textbook
eBay

GoodStorm
Google Base
Google Checkout
PriceRunner
Shopping.com
SwapThing
UPC Database
Windows Live Expo
Yahoo Shopping
Zazzle
Storage
Amazon S3
Box.net
MoveDigital
Omnidrive
Open Xdrive
Openomy
Tagalag
TagFinder
Tagthe.net
TagTooga
Video
Truveo
Blinkx
Dave.TV
LiveVideo
Revver
Veoh
Video Detective
Yahoo Video Search
YouTube
Widgets
ClearSpring
Google Gadgets
Netvibes
Pageflakes
Serence Klip

SpringWidgets
TagWorld
Windows Live Gadgets
Windows Sidebar Gadgets
Yahoo Widgets
Yourminis
WIKI
DBpedia
JotSpot
PBwiki
WikiMatrix

eta-de-apis-web-20/1012
Administración de publicidad con Adsense
Anunciarse en buscador Google
Servicios de publicidad online de Microsoft
Optimización de búsqueda y seguimiento de enlaces
Search engine optimization services
Administración de anuncios online de Yahoo
Plataforma de publicidad en búsquedas
Questions and answers service
Blog and feed search service
Database of spam blogs
Servicio de búsqueda en blogs y feeds
Base de datos de blogs de spam
Blog search and news aggregation service
Servicio de búsqueda en blogs
Servicio de prevención de spam en blogs
Servicios para Bloggear
Servicio de email para blogs
Blog promotion tracking service
Blogging software
Blog management
Blog management
Blog ping service
Servicios Blogs
Social bookmarking
Social bookmarking
Social bookmarking service
Social bookmarking service
Social bookmarklet service

Social bookmarking and community
Social bookmarking
Servicio de Calendario
Servicio de Calendario
Servicio de Calendario online
Servicio de mensajería instantánea
Online presence service
Aplicación de Chat
Instant messenger buddy
Online chatroom services
Chat y mensajería
Web based instant messaging
Mensajería instantánea
Content sharing community
Distributed user reviews service
Social networking service
Social events service
Content sharing platform within Facebook
Community site
Email address validation service
Email delivery services
Email marketing service
Bulk email service
Email forms and templates service
Email marketing management
Email verification service
Email management services
Email hosting service
Email management services
Web based email system

On-demand human resource management
User provisioning for Google Applications
Time series forecaster
Enterprise document management service
Business application suite
CRM services
Conferencing and collaboration services
Calendario de Eventos
Events discovery and demand
Events and clubs database
Collaborative event calendar
Local events search and community
Online invoicing services
Ratios de conversión entre monedas
Credit check
Online invoicing and time tracking
Online accounting software
Expense tracking
Online accounting service
Peer-to-peer network
Stock price quotes for US equities
Historical mutual funds
Real-time stock quotes
Personal finance management and community
Lookup service for US elected officials by address
Political geography lookup for Illinois
Advocacy services for nonprofits
Database of US government spending
Database of US campaign contributions
Rhode Island state data services
US federal documents database
European Patent Office web services

US Congress database service
Track the UK Parliament
Database of US congressional representatives
Thumbnail images of web site home pages
Web site traffic rankings
Elastic Compute Cloud virtual hosting
Servicio de estadísticas para sitios web
Internet web site metrics and analytics
Geo coordinate translation
Service for API creation
Internet domain name lookup
URL shortening
Web analytics
IP lookup
HTML to PDF conversion
Non-profit Internet library
Determine IP address from domain name
Web site metrics and reporting
Web site monitoring services
Feed publication
Web forms and application framework
Web map engine
Web site monitoring and reporting
Redirección de URL
Systems management and monitoring
Proposal for web clipboard
Web site metrics tools
Attaches discussions to any site
Thumbnail image generation
Web site administration
Web site analysis service
Job search services
Job board posting service
Mapping and GIS services

Location based advertising
Location-based services
Web services for geographical information
Blog geo-coding
GPS services and mapping
Geocoding services for US
Geocoding services for Canada
Geospatial analysis and heat mapping service
Geographic name and postal code lookup
Aerial photography and mapping service
Mapping services
Mapping services
Mass transit and walking directions
UK Postcode Geocoder
Mapping services
Photo mapping
Online mapping service
Mapping API abstraction layer
Location and geotagging services
Mapping services
Mapping services
Global online mapping service
Satellite mapping images
Korean mapping service
Geocoding service for UK
Geocode any US address
Mapping API abstraction layer
The Free Wiki World Map
Collaborative geographic service
Location discovery service
3D mapping service
Mapping service
Urban geo-spatial data services
Determine elevation based on latitude and longitude
Mapping, directions, and travel booking
Map creation and sharing service
Mobile GPS widget platform
Location tracking
Non-mapping geospatial services
Online mapping service
Australian and New Zealand mapping service
Wireless network mapping
Geocoding services

Map image creation service
Mapping services
Embedded maps and international geocoding
Australian mapping service
Multimedia archive database
Video sharing service
Digital media remote access and management
Photo and video sharing service
Online media storage
Medical database lookup
Bioinformatics data services
Life sciences search services
Bioinformatics research database
SMS, WAP, and email messaging
SMS solutions portal
SMS Messaging services
Social messaging service
SMS marketing messaging service
SMS messaging
Messaging services
IM to RSS conversion service
SMS messaging services
SMS messaging services
Mobile email messaging service
Moblogs
Messaging services
Location based data for the Twitter service
Communication software for online communities
SMS messaging service
Music playlist management
Podcast search

Photo and media sharing service
Feed caching service
Online CD catalog service
Music playlist management
Music services
Music metadata community service
Music fingerprinting service
Social music service
Music recommendation and discovery
Online music services
Music recommendation service
Digital music marketplace
Visual artists works repository
Music metadata management
Music playlist management
Customizable music player
Desktop music player
News aggregator
Natural language processing tools
Online News Service
Personalized news aggregation
Data access service
News delivery
Social news service
Online news aggregation
Online information manager
Web based contact management
Online spreadsheet
Document management services
Online spreadsheets
Online spreadsheet service
Presentation sharing community
Online office suite

Online photo management
Photo sharing
Photo sharing service
Royalty free stock photos
Photo management and sharing service
Animated slideshow service
Photo upload site with organizer
Online photo services
Photo search
Stock photography service
Photo sharing service
Online photo editing service
Photo sharing service
Online photo service
Photo sharing service
Distributed recommendation service
Recommendation service
Portable ratings system
Local user reviews and city guides
Dictionary lookup service/td>
Address lookup service
Research company background data
Business research services
Third party Wikipedia web service
Books database
Information database search
Technical reference library
Academic research repository
Phone number validation service
Lookup address and name via phone
Demographic reference data
Global address verification service
Telephone number verification
Insider trading transaction information
Adds address and statistical data based on phone number
Residential directory lookup and validation service
Reverse phone lookup services

Sales and use tax data service
APIs for variety of reference data sources
Census data information service
Corporate profiles web service
Library 2.0 reference services
Slang dictionary lookup
Telephone directory
Community driven reference service
Web site information and traffic data
Web Search Engine
Web search components
Code search service
Desktop search and gadgets
Search services
Democratic search engine
Korean search engine
Structured web search
Internet search
Social search service
Image search services
Local search service
Personalized search services
Search suggestion service
Search services
Contextual search service
Authentication services
Online retailer
Historical product sales data
Internet based payment gateway services
Affiliate marketing network
Shopping services
Online affiliate programs
eBay pricing and sales trend data
Book price comparison service
Online auction marketplace

Online retail ecommerce
Platform for structure and semi-structured data
Shopping cart services
Shopping comparison engine
Online retail shopping
Community driven swapping site
UPC lookup service
Online classifieds service
Shopping services
On-demand product creation service
Online storage services
Online file storage
File delivery and management services
Online storage services
Online data storage service
Online file system
Email tagging
Tag extraction service
Tag recommendation service
Tag based Internet directory
Video search
Video search
Video distribution network
Video repository and user community
Video services
Virtual television and video network
Film trailers, cast, images, and related information
Video search
Video sharing and search
Widget creation, distribution, and tracking services
Personalized home page with widgets
Personalized start page and widgets
Desktop gadgets

Widget platform
Social web services
Online gadgets service
Desktop gadgets
Desktop widgets
Personalized start page
Interfaz estructurada para solicitudes a Wikipedia
Utilidad de colaboración con estilo Wiki
Consumer wiki farm
Servicio de búsquedas y comparaciones en Wiki