Beats is the platform for building lightweight, open source data
shippers for many types of operational data you want to enrich with
Logstash, search and analyze in Elasticsearch, and visualize in Kibana.
Whether you're interested in log files, infrastructure metrics, network
packets, or any other type of data, Beats serves as the foundation for
keeping a beat on your data.

Filebeat is a lightweight, open source shipper for log file data. As the
next-generation Logstash Forwarder, Filebeat tails logs and quickly
sends this information to Logstash for further parsing and enrichment or
to Elasticsearch for centralized storage and analysis.

Metricbeat Collect metrics from your systems and services. From CPU to memory,
Redis to Nginx, and much more, Metricbeat is a lightweight way to send system
and service statistics.

Packetbeat is a lightweight network packet analyzer that sends data to Logstash
or Elasticsearch.

WWW: https://www.elastic.co/products/beats/