GPLDL - 1066 GPL-licensed WordPress themes & plugins for free
CloudSight - Image recognition API; send an HTTP request with an image, get a description of contents.
LyrWP - WordPress themes / plugins / services curated.
Dashmote - Dashmote bundles stock image providers to make finding stock images as easy as possible.
Blocksy - A lightningfast, innovative and supercharged WordPress theme
WTF is that? - Send any picture and it will tell you what it is!