WhatsUp Gold for monitoring CPE, but now all CPE monitoring is done by Enigma.

We used to use WUG, because it has very flexible alerting configurability which is needed for our access points on towers, but it just cannot scale. It was not able to handle more than several hundred nodes before its performance would suffer significantly. And it was even thinning out the data tables (rolling up data) starting at an age of 12 hours (by default). WUG may have improved since the decision was made to move away from them, but we felt that the Linux/MySQL platform would be better able to handle the larger-scale demands without costing us a lot in licensing. 

For example with WUG being Microsoft SQL only, one must spend quite a bit of money to get the SQL version that will use more than 64GB of RAM. Currently, we have Enigma on a VM in vSphere with 100GB RAM, 12 CPU cores (Cisco UCS Mini with B200 blades, and NetApp all-flash storage). To increase the processing capacity, all we have to do is give it more resources (RAM, CPU, Storage).