Citrix Netscaler

Citrix NetScaler is a powerful web application delivery appliance and load balancer. A Citrix NetScaler is capable of being deployed using high availability (HA) by configuring an HA VPX pair.

Important: NetScaler VPX servers are not redundant unless configured in HA mode with a partner. Therefore, it is highly recommended to deploy using HA.

Citrix NetScaler is the only product that can load balance traffic on both the public and private networks.
 
NetScaler also offers full Layer 4 and Layer 7 load balancing functionality.  Utilizing a web application firewall, SSL offloading, and custom load balancing rule definitions - the NetScaler is a network protection and traffic optimization toolkit.