Essentials
This is the stack I actually use. Not a list of everything I've ever tried, not affiliate links to the highest-paying tool in each category — just the tools I pay for with my own money and still use every day. Some of the links below are referral links; if you sign up through one, I may earn a commission at no extra cost to you. I only recommend what I use.
Traffic Sources
Where I buy traffic from. These are the networks I actively spend on.
Trackers
Tracking is the foundation of any serious media buying operation. These are what I use.
Spy Tools
For finding what competitors are running and what angles are working.
Affiliate Networks
Where I run offers when I'm doing direct linking or affiliate promotion.