GetApp.com: Looking for that app to do that? GetApp is a great place to see the latest, greatest apps for business. Filtering allows you to find your platform easily, whether you’re looking for iOS, Android or web-based.
TaxRates.com: If you ship things everywhere and/or purchase things everywhere, this is a neat little site. You can download tax rates in effect this month, or use a handy sales tax calculator on the site for free. There’s also a free service you can sign up for to get more data.
Archives.gov: This site lists free and subscription-based databases that give you everything from Ellis Island records to declassified CIA data.