DejaGnu - DejaGnu is a framework for testing other programs.
Gratitude Flow - Gratitude Flow is a web extension that allows you to share and receive gratitude on your new tab with real people around the world.
Expect - Expect is a tool for automating interactive applications such as telnet, ftp, passwd, fsck, rlogin...
Google Arts & Culture - Explore collections of art and culture from around the world, both past and present.
Check - Check is a unit testing framework for C, which runs on environments such as GNU/Linux, GNU/Hurd, BSD, and Mac OSX.
New Tab by Flickr - Get a beautiful photo each time you open a new tab