SolarWinds Network Performance Monitor is listed under Network monitoring by SolarWinds. The 12 alternatives below are listed in the same category and are compared on starting price, features and reviews from other MSPs.
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Site24x7 Cloud-based network and infrastructure monitoring for MSPs starting at 3 USD per device per month. SolarWinds Network Performance Monitor vs Site24x7
Obkio Network performance monitoring with distributed agents and SNMP support for multi-site visibility. 
Zabbix Open-source enterprise monitoring with no per-device fees, available as self-hosted or managed cloud. 
Checkmk Infrastructure monitoring for hybrid environments, Community free or from €190 per month. SolarWinds Network Performance Monitor vs Checkmk
PRTG Network Monitor Sensor-based network monitoring with a free tier and subscriptions from 200 dollars per month. SolarWinds Network Performance Monitor vs PRTG Network Monitor
WhatsUp Gold Network monitoring with topology mapping and multi-site visibility, flexible licensing models. SolarWinds Network Performance Monitor vs WhatsUp Gold
Auvik Cloud network monitoring with automated topology mapping and device configuration backup. 
Cisco Meraki Dashboard Cloud-managed network platform for wireless, switching, SD-WAN and IoT device oversight. 
LogicMonitor Network and infrastructure monitoring with AI-powered anomaly detection, quote-only pricing. Cisco ThousandEyes Global network monitoring for SaaS and internet-enabled applications from 200+ vantage points. 
LibreNMS Open-source network monitoring with automatic discovery, alerting and distributed polling. 
ManageEngine OpManager Network monitoring for routers, switches and firewalls with automatic discovery and alerting. SolarWinds Network Performance Monitor vs ManageEngine OpManager| Feature | SolarWinds Network Performance Monitor | Site24x7 | Obkio | Zabbix | Checkmk | PRTG Network Monitor | WhatsUp Gold |
|---|---|---|---|---|---|---|---|
| Automatic network discovery | yes | yes | yes | yes | yes | yes | yes |
| Topology mapping | yes | yes | yes | yes | yes | yes | yes |
| Device configuration backup | unknown | unknown | no | unknown | yes | yes | yes |
| Uptime and outage alerting | yes | yes | yes | yes | yes | yes | yes |
| Bandwidth monitoring | yes | yes | yes | yes | yes | yes | yes |
| SNMP support | yes | yes | yes | yes | yes | yes | yes |
| Wireless and access point monitoring | yes | yes | yes | unknown | yes | yes | yes |
| Configuration change detection | unknown | unknown | unknown | unknown | yes | yes | yes |
| Multi-site dashboard | yes | yes | yes | yes | yes | yes | yes |
| Documentation integration | unknown | no | unknown | unknown | unknown | unknown | unknown |
| Remote access to devices | unknown | unknown | unknown | unknown | yes | unknown | unknown |
| Hardware probe option | unknown | unknown | yes | no | unknown | yes | yes |
Site24x7, which matches 7 of the 7 features SolarWinds Network Performance Monitor supports.
Site24x7, Obkio, Zabbix, Checkmk, PRTG Network Monitor and LibreNMS have a free version.
