Ars-Imago Monobath is an all-in-one developer for Black and White film. you can develop and fix at the same time with only one bath.
Just mix 500ml of Part A and 500ml of Part B to get 1L of working solution in a jug. Pour the solution into the developing tank and 8 minutes is all it takes at 20 degrees C for most black and white film to be developed (and fixed). No stop bath required.