Graylog is a popular log management platform that rivals ELK in popularity. It handles NetFlow ingestion very well and has a cleaner interface than raw Kibana. It is a solid middle-ground choice for those who find ELK too fiddly but want more power than ntopng.
NetFlow is a network protocol developed by Cisco Systems for monitoring and analyzing network traffic. It provides detailed information about the source and destination of network packets, including IP addresses, ports, protocols, and packet sizes. This data is useful for network administrators to identify trends, troubleshoot issues, and detect security threats. netflow collector free