Transferslot - Easily buy and sell side-projects

Flippa - Flippa is a platform for trading websites.

MicroAcquire - A free & anonymous startup acquisition marketplace

Cocreate Idea - Cocreate Idea is a platform for ideas, our mission is to help you grow your idea to the next level...

BitsForDigits - An acquisition marketplace for profitable internet businesses. We make it anonymous & free for owners of $100K+ revenue startups to attract full & partial acquisition offers. Free for acquirers to join for a limited time. No commissions, ever.

Borderline.biz - Borderline is a marketplace for side projects. Buy & sell web applications, big or small, profitable or not, entirely for free.