With Advanced Server Status you can monitor servers, enter custom server groups, choose which ports you want to be monitored in each group, show the current % uptime of each server.

Abuse Center is a whmcs addon that monitors Database size, Inodes, CPU executions. For admins, it gives an abuse report history for each client/product. For clients, it shows a “resolution center” in the client area, with reports of abuses. Manual abuse issues can also be created, for anything like hacked sites, phising sites etc.