Just about any recirculating skimmer can be deployed in this way. You'll need to "T" off your drain line and install valves so you can regulate the flow into the skimmer.
Any of the MRC, Euro Reef, etc recirculating units can do this and can be set up externally, but even the larger skimmers (rated for say 400+ gallons) only want about 300-400 or so gph in flow.