Developed by Stephan Korte, the 3×3 program is a two-phased powerlifting program: one high volume, one heavy weight. While only calling for three workouts per week, each session includes the squat, bench, and deadlift.
The program can be run as a 4 week or 8 week program, depending upon whether one or two phases are run.
The 3×3 program, as laid out by Korte:
Spreadsheet Source (with slight enhancements by Lift Vault)