Transferslot - Easily buy and sell side-projects
TaxJar - TaxJar simplifies sales tax filing for eCommerce sellers.
MicroAcquire - A free & anonymous startup acquisition marketplace
Avalara - Cut tax compliance costs, not corners. Avalara automates tax compliance and can help improve accuracy while reducing costs.
Flippa - Flippa is a platform for trading websites.
Quaderno.io - Quaderno for Stripe is the simplest way to bill your customers without programming a single line of code.