For square and flatbar, I use this tool found at a yard sale. It's made from a large roller bearing with a round shaft welded off center to the inside bearing surface. A flat bar is welded to the outside surface. When the lever is pulled, it creates a cam motion. I can straighten 3/4 x 1-1/2 flat both ways with a 4 foot handle and a little effort. I've also used it to generate large curves for railings.
Motorized hydraulic presses work good, also.
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