Thick bar curls-2" and 3" bars
Hammer curls-normal and cross body
Deadlift hold-barbell,dumbells,or farmers implements
Farmers walk-db's or farmers
Hercules hold in the cable crossover thing-different finger combinations
No straps on anything
These are the sort of things I do.My forearms arent amazing,but then again I dont really train them directly,or focus on getting huge forearms,but they are getting bigger and stronger.Every once in a while I might superset deadlift holds with behind the back wrist curls,or extensions..or I might do different wrist curl and extension movements with bands,or use the grippers