Codester - The marketplace for ready-to-use web development assets
GoodBarber - GoodBarber is a mobile app creation platform.
CodeCanyon - Scripts and Snippets From $1 for PHP, JavaScript, ASP.NET, CSS, Plugins, HTML5, Mobile and more
Dropsource - Mobile development platform for building native iOS & Android apps
PieceX - PieceX is a new platform available for buying and selling source code. All Engineers, From beginner programmers to senior engineers can use the PieceX. It provides source code in many languages including Java, C#, PHP ....
Bizness Apps - Create your own app or become a reseller and build apps for others