General Tools recently announced the release of the E∙Z ProTM Mortise & Tenon Jig (Model 870).The E∙Z Pro Mortise & Tenon Jig comes completely assembled and ready to use right out-of-the-box. Included is a quick-change guide-sleeve assembly and 1/4" up-cut spiral carbide bit to produce the widely used 1/4" mortise and tenon joint, as well as guide-sleeve assemblies for 3/8" and 1/2" joints. Using a plunge router with the jig, woodworkers can quickly and easily cut a fully aligned matching mortise and tenon of 1/4", 3/8" or 1/2" thick and from 1" to 3" wide. The unit can easily handle stock ranging from 1/2" to 1½" thick and can cut multiple mortises in a single long piece. The unit can be mounted directly on a workbench or onto a board that can be clamped in a vise or to a bench.
More information is available here.