Tiny Acquisitions - Tiny acquisitions is the only marketplace for internet business that are priced under $5,000.

MicroAcquire - A free & anonymous startup acquisition marketplace

Microns - Microns.io is a marketplace to discover the best micro-startups for sale.

MicroFounder - It's possible for a solo developer to build a profitable microstartup to pay the bills and live life on their own terms.

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.

Transferslot - Easily buy and sell side-projects