Transferslot - Easily buy and sell side-projects
Product Hunt - A website that lets users share and discover new products
SideProjectors - Marketplace to buy and sell side projects
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.
HAMO - Work together to promote and fund interesting side projects🚀
1Kprojects - Neglected side projects for less than $1000.