MicroAcquire - A free & anonymous startup acquisition marketplace
SmartBribe - Get free traffic to your site (turn one visitor into three)
Dibz - Put your link building efforts on autopilot
Google Ad Manager - Grow revenue wherever your users are with an integrated ad management platform that surfaces insights for smarter business decisions.
Shortlist Metrics - A simple tool to help you scale your link building faster
OpenX - Ad technology platform available as a hosted service or as an open source download.