Limbo - “Dark, disturbing, yet eerily beautiful, Limbo is a world that deserves to be explored.” Joystiq. “Limbo is as close to perfect at what it does as a game can get.” Destructoid. Buy LIMBO: Special Edition.

NimbleText - NimbleText is a text manipulation and code generation tool available online or as a free download.

Super Meat Boy - Let's start with what's the same: Dr. Fetus is still a jerk, gameplay is super challenging but fair, there are tight controls and great levels and you will die. a lot.

WordCounter.net - Count words, sentences, paragraphs etc.

Insanely Twisted Shadow Planet - In this 2D action adventure so damn twisted, explore unique environments and battle bizarre...

Heytools - JavaScript tools, AJAX tools and some fully server side tools.