i have used my husband "T-Bar" (used for cutting long straight lines,like drywall) for squaring up the quilt. I did it on the basement floor,that is not carpeted.
also used my husbands 90 degree laser level for the same thing.
duct tape to hold down the backing when pinning.
i ran out of loose chalk once, while marking the quilt, as i was quilting (i do it in sections)and used flour in a pinch..