1) Zynx : http://www.zynxhealth.com/Solutions/ZynxOrder.aspx Very dated and expensive.
2) Provation : http://www.provationordersets.com/index.aspx Slightly better but small market share compared to Zynx.
3) Elsevier : http://www.clinicaldecisionsupport.com/order-sets New player yet to launch. Cloud based.