Developer's Guide - Google Chart API - Google Code
The Google Chart API lets you dynamically generate charts. This can come in realy handy if you don't want to implement your own charting engine.
google
api
mootools - home
ajax
api
javascript
framework
library
opensource
Facebook API Module(s) | Project Opus Docs
api
drupal
facebook
API Listing - ProgrammableWeb
api
web2.0
webdev
programmableweb
Mapstraction - a javascript library to hide differences between mapping APIs.
api
maps
googlemaps
mapping
javascript
library
mashup
script.aculo.us - web 2.0 javascript
ajax
api
programming
javascript
web2.0
Yahoo! UI Library
ajax
webdev
api
.net CART ASP.NET Shopping Cart and Ecommerce Solution for .NET (DOTNET)
API based tool
storefront
software
api
.net
Creative Commons Attribution Non-commercial Share Alike 2.5