Transferslot - Easily buy and sell side-projects
Product Hunt - A website that lets users share and discover new products
MicroAcquire - A free & anonymous startup acquisition marketplace
AlternativeTo - AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by recommending alternatives to apps you already know.
1Kprojects - Neglected side projects for less than $1000.
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.