Ask HN: What are you favorite tiny tools?

Everybody I know has a set of little software tools that they use that make their work either slightly easier or slightly more pleasant.

What are the tiny tools that you use for your work?

Some of mine:

Skitch -- Little Mac app that makes it easy to take screenshots and draw/write on them

Be Focused -- A simple Pomodoro timer for Mac

"Remove Stickies" -- A URL bookmarklet I wrote that removes all floating elements from a page