CloudSight - Image recognition API; send an HTTP request with an image, get a description of contents.
Codester - The marketplace for ready-to-use web development assets
Dashmote - Dashmote bundles stock image providers to make finding stock images as easy as possible.
CodeCanyon - Scripts and Snippets From $1 for PHP, JavaScript, ASP.NET, CSS, Plugins, HTML5, Mobile and more
Rubric - Generate an instant, cool caption for your photo
CodeGrape - CodeGrape is an online marketplace for Themes, WordPress, Plugins, PHP Script, JavaSCript, HTML5, Mobile Apps, Print, Graphic and CSS files.