There are plenty of databases which are free and you can use to begin your research.
We began by listing the data sets which are validated because they have been submitted by a reputable source, e.g. the government itself or a public organization e.g. WHO and UN. We have also included data sets from major media and publishers here. Most of them are free although there are also data sets for purchase. This is by all means not the only sources of information.
Validated (Government or reputable enough sources, e.g. media)
Data Market Azure by Microsoft Data sets for purchase
Unvalidated (Public or user submitted data sets)
Crunchbase - technology and startups
Datamarket - An extensive library of datasets
Some more resources
Infochimps Data APIs for purchase
Datawrangling – A long list of URLs to check out for data sets. We noticed that some of the URLs expired and are no longer in use.
Several apps which you use on a daily/weekly basis that contains a wealth of information you could use in an infographic
Web analytics: Google Analytics
Project management tools: Basecamp
Sales management tools: Salesforce
Survey tools: SurveyMonkey
Photo sharing tools: Flickr
Email marketing: MailChimp