More of a template than a strict program, many variations of 5/3/1 exist. You’ll find some of the best spreadsheets for these variations here. All of them will get you stronger by focusing on steady progression of the Big 3 lifts though. Jim Wendler’s popular 5/3/1 template was highly influential on the popular GZCL and nSuns programs.
The program is comprised of 3 and 4 week cycles, designed to run indefinitely.