Codester - The marketplace for ready-to-use web development assets
CodeCanyon - Scripts and Snippets From $1 for PHP, JavaScript, ASP.NET, CSS, Plugins, HTML5, Mobile and more
Droners.io - Get anything filmed by a drone (Airbnb for drone pilots)
CodeGrape - CodeGrape is an online marketplace for Themes, WordPress, Plugins, PHP Script, JavaSCript, HTML5, Mobile Apps, Print, Graphic and CSS files.
Xtendify - Marketplace for Open Source CMS and Frameworks.
Unity Asset Store - Unity's asset marketplace for game makers.