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EDIT: The Web Technologies and Services CRAN task view contains a much more comprehensive list of data sources and APIs available in R. You can submit a pull request on github if you wish to add a package to the task view.

I'm making a list of the various data feeds that are already hooked into R or that are easy to setup. Here's my initial list of packages, and I was wondering what else I'm missing.

I'm trying to limit this list to "real time" or "close to real time" data feeds/APIs, where the underlying data might change between downloads. There's plenty of lists out there for static datasets, which only require one download.

This list is currently biased towards financial/time series data, and I could use some help expanding it into other domains.

Free Data:

Data Source - Package

Google Finance historical data - quantmod

Google Finance balance sheets - quantmod

Yahoo Finance historical data - quantmod

Yahoo Finance historical data - tseries

Yahoo Finance current options chain - quantmod

Yahoo Finance historical analyst estimates - fImport

Yahoo Finance current key stats - fImport - seems to be broken

OANDA historic exchange rates/metal prices - quantmod

FRED historic macroeconomic indicators - quantmod

World Bank historic macroeconomic indicators - WDI

Google Trends historic search volume data - RGoogleTrends

Google Docs - RGoogleDocs

Google Storage - RGoogleStorage

Twitter - twitteR

Zillow - Zillow

New York Times - RNYTimes

US Census 2000 - UScensus2000

infochimps - infochimps

datamarket - rdatamarket - requires free account

Factual.com - factualR

Geocode addresses - RDSTK

Map coordinates to political boundaries - RDSTK

Weather Underground - Roll your own

Google News - Roll your own

Earth Sciences netCDF Data - Roll your own

Climate Data - Roll your own

Public health data - Roll your own

OAI Harvester - Open Archives Initiative harvester

RAmazonS3 - S3 Amazon storage server

Rflikr - Flikr api

Requires a subscription:

Bloomberg - RBloomberg

LIM - LIM

Trades and Quotes from NYSE - RTAQ

Interactive Brokers - IBrokers