Network / NMS
ntopng
ntop
Best-in-class open-source traffic analysis + DPI — see who's talking to whom, top talkers, app/protocol breakdown, with nProbe/Cento scaling to 100 Gbit.
- Category
- Network / NMS
- License
- Open core
- Deployment
- Self-hosted
- Cost
- Free
- Free tier
- Yes
- Self-host effort
- Moderate
- Maturity
- Established
- Popularity
- ≈7.8k GitHub stars; go-to FOSS flow analyzer
The catch
It's a traffic-analysis/flow tool, not a full SNMP NMS (no up/down device management), and the genuinely useful parts at scale (nProbe, Cento, Enterprise) are commercial despite the "open source" halo.
Monitors
NetworkMetrics
Protocols
NetFlow / sFlow / IPFIX
Capabilities
DashboardsFlow analysisAnomaly detectionAPI
Built for
SRE / DevOpsMid-marketHomelab
The honest take
The FOSS way to answer “what is actually eating my bandwidth right now.” Pair it with an SNMP NMS — ntopng tells you about traffic, not whether the switch is up.