SideProjectors - Marketplace to buy and sell side projects
Product Hunt - A website that lets users share and discover new products
Ship Your Side Project - Make enormous progress on your side project in just 6 weeks
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.
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.
The Side Project Scoring Tool - A system to help creative people pick the right idea