We all know and love services like Dropbox, Evernote and Gmail. But if there's one thing we love here at Lifehacker, it's those small, lesser-known applications that make life easier.
Add your suggestions in the comments below. We won't discriminate based on platform. Any tool is welcome! Try to format your entry along these lines so it's more readable:
Name of app (Platform) Download link Description/why you find it indispensable.