I will state this with the disclaimer that something might have changed that I dont know about. If so, then I apologize for being misleading. The D obviously reflects class and the X is the number of continents or miles of the fare.

Oneworld Explorer - DONEX
Continent based. Six free segments in North America and four for each of the rest, max 20. Must go around the world. Two stops in continent of origin, unlimited stops in the others.

Circle Indian / Circle Explorer - DONECX
Continent based, fare is the same as the Oneworld Explorer. Depending on whether you ask BA or Sabre, either the same segment number restrictions as a Oneworld Explorer or unlimited segments, max 20. Do not need to go in a circle but not around the world. Max two stops per continent with max total of six stops.

Circle Pacific - DCIRXX or DCIRXXSA with South American option
I know nothing about it other than it's mileage based. Look at http://www.hardlink.com/~markdu/OWFiles/OneCirPac.html for more info.

Global Explorer - DGLOBXX
Mileage based. Can do either 26k, 29k, or 34k on economy but biz and first are limited to only the 34k option. You can use FJ, GF, and PH in addition to the eight oneworld carriers along with a few others like SA on the Qantas codeshare from South Africa to Australia. There are stopover restrictions which for most tickets will be 5 per continent with 15 total however youre restricted to two in the continent of origin.

If there is any besides these four then I dont personally know about them. It's possible but seems unlikely since the people here keep pretty good track of things.

Good luck with your planning.