Transferslot - Easily buy and sell side-projects
MicroAcquire - A free & anonymous startup acquisition marketplace
Investors Club - Profitable online businesses vetted & handed right to you
1Kprojects - Neglected side projects for less than $1000.
Tiny Acquisitions - Tiny acquisitions is the only marketplace for internet business that are priced under $5,000.
Flippa - Flippa is a platform for trading websites.