Golfshot - Golfshot is the #1 provider of pre-mapped aerial image courses.
Disc Golf Metrix - Live scorecard and statistics for disc golf
DiscAtlas - All the Disc Golf info you want, right in your pocket! Find courses, browse discs, record rounds and more!
FreeCaddie - The Original Golf GPS App, with most accurate Golf GPS Coordinates and Golf Course Maps, FreeCaddie is the completely free golf GPS rangefinder for your phone.
UDisc - UDisc can keep score, measure throws, find courses, and track stats. UDisc Cloud syncs scorecards between the players on your card.
GolfTraxx - GolfTraxx iPhone edition v1.2 updates the popular GolfTraxx Golf GPS solution to iPhone 3G users.