This woodworkers list of free woodworking plans and projects features a collection of workshop clamps and related jig pieces that any moderately skilled do-it-yourselfer can build. The woodworking information found on these sites range in quantity and quality. Please contact individual web sites if you have questions about those woodworking projects.
Build your own power wedge bar clamps for your workshop. Not as hard as you would assume. This one has a simple wedge to lock the moving jaw to the smooth bar. It is infinitely adjustable. Just slide it closed and start tightening.