I have quite a few.  I'd be lost without my iPhone.

I use CourseWalk instead of a wheel for walking XC these days, as does my trainer.  I have StartBox to look up Event scores, but most of the time I just go to eventingscores.com instead.  I have gotten good use out of the EquiTests series.  It is nice to have Dressage tests in my pocket.  SpeedCheck was well worth the $12 to have something that I can pace gallop sets with and use to teach myself what 350 meters per minute feels like vs 420 meters per minute.  I have heard good things about HorseSpanish and may grab it shortly. 

Spooksandbolts wrote:
blah, blah, blah, blah and the dog ate your homework and I can smell bovine excrement