VMware NSX

Apache CloudStack provides an official plugin for VMware NSX (currently supporting NSX-T). This plugin allows administrators to define isolated networks in CloudStack which are then backed by NSX-managed logical switches and routers.
Netris

Netris integrates with Apache CloudStack via a native network plugin introduced in version 4.21. The plugin allows CloudStack administrators to manage L2/L3 networks, NAT, DHCP, ACLs, load balancing, and VPCs directly through the CloudStack interface — all orchestrated via Netris.
Tungsten Fabric

Solve your tooling complexity and overload with the simplicity of only one networking and security tool. Save time and swivel-chair fatigue from context switches.