This one checks all of the boxes for me. Two of my favorite LTDs for discovering low-competition keyword have gone belly up, so I was excited to see that functionality from Topical Map AI. I tested TMA right after purchasing and didn't find the interface very intuitive, but it's come a long way in two months. The data now matches what's available on monthly paid services, and I really like how the software can move seamlessly from the various maps to content briefs. Excited to see where it goes from here!