Equipment Supporting 2.5gbps and 5gbps

I've a couple 10 port Cisco switches that support 2.5 and 5gbps over cat5e, just wondering if there are any other vendors out there with offerings that support these newer ethernet speeds. Supporting cat5e for these multi-gig speeds is a real boon in many circumstances given the wide popularity of it in many buildings. Does anyone have any experience with or knowledge of other products, switches in particular, supporting 2.5 and 5 gbps? Thanks.