Big Sister review
Open-source monitoring for teams needing core reachability, SNMP, history and alarms.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Big Sister is a self-hosted system and network monitoring application for administrators tracking networked systems and services. Agents check local machine status and test neighboring systems and services, while a status collector receives reports, generates web pages and raises alerts. It fits small and mid-market teams that need basic reachability, service and SNMP monitoring across Linux and Windows environments.
Big Sister is free software under the GPL, with no paid tiers described. Deployment uses server and agent components, and the documented packages target Linux and Windows. The collector presents real-time status views, configurable grouping and summarized pages through the web interface. Status-change history, logs and performance data provide a record of conditions over time, while email or pager alarms can notify administrators when states change. Teams choosing it should be prepared to operate the monitoring service themselves rather than relying on a hosted deployment.
Its monitoring depth centers on practical checks: ping, TCP, SNMP and DNS, along with traffic and synthetic checks listed in its category specifications. RRDTool collects and graphs performance data, giving administrators trend views alongside current status. The trade-off is scope: Big Sister does not provide topology maps, and its positioning does not include a broad integration ecosystem. The official site lists stable release 1.12, with the latest version news shown from 2017; organizations evaluating ongoing maintenance should weigh that signal. Big Sister suits teams seeking a focused, free monitor with agent reporting and classic alerting, while teams needing visual topology or extensive integrations should look elsewhere.
Big Sister pros and cons
- Where it wins
- Free GPL software with self-hosted deployment
- Ping, TCP, SNMP and DNS checks with status history
- RRDTool graphs, grouping and email or pager alarms
- Where it doesn't
- No topology maps for visual network discovery
- Fewer broader integrations than larger monitoring platforms
- Server-agent deployment requires self-hosted administration
Big Sister fact sheet, pricing and score →
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