Product: Tail-f NCS embraces both top-down and bottom-up approaches to SDN, with support for OpenFlow (1.0 now, 1.3 later this year) and transaction-safe northbound APIs across OpenFlow and legacy devices.

Company: Tail-f Systems

Key Features:
Download Tail-f's feature matrix

Price Range:
Tail-f offers NCS in two business models; upfront fee or subscription based licensing. Price depends on on product features and the size and complexity of the network to be managed. As an example, NCS for an enterprise network with up to 200 access switches would cost $4,900 per month on subscription basis.