Mockingbird : Mockingbird is an online tool that makes it easy for you to create, link together, preview, and share mockups of your website or application.
Favicon Generator : Upload an image (GIF, JPEG or PNG) and convert it to a Windows favicon (.ico)
Tabula : Tabula helps you liberate data tables trapped inside PDFs
RoundPic : Online tool for making anti-aliased rounded corners (very Web 2.0!) for avatars and images
SQL Fiddle : A tool for easy online testing and sharing of database problems and their solutions.
