AlternativeTo is a useful and oddly addictive website which lists alternatives to software and mobile apps. You can search the site instantly with the !alt bang.
Syntax: !alt name_of_software (platform and license modifiers can be added but are optional)
Example with target platform: !alt evernote linux
Example with license: !alt skype opensource
Example with platform, license: !alt itunes linux opensource
Is It Taxed? tells you instantly if there is !tax on thousands of items sold in Canada. Discover money saving strategies and make your dollar go farther.