In addition to FlyerMiler.com , this report evaluates some of its competitors. Here is a report on FlyerMiler.
http://frequentmiler.boardingarea.com/2016/03/11/the-best-award-price-finder-case-study-part-1/
and another report which adds Milez.biz:
and a third report:
The competitors include:
- AwardAce
- FlyerMiler
- Milez.biz
- Travel Codex’s Award Chart Search Tool
- Ultimate Frequent Flyer Mile Award Calculator