Spiceworks does require domain account or ssh credentials for switches/routers but it is a really good monitor. I bugeted last year for a mounted a TV on the wall and got the equipment setup recently, now we have a 4k resource monitor and a heartbeat alert sound in our office if something goes down. Plus we get email if its down for more than 2 minutes. The monitor shows CPU, RAM and Disk usage of servers and has alerts on-screen when any of those resources are continually over burdened. Its really helped streamline our load balancing efforts.