Logstash

Logstash is a server-side data processing pipeline for collecting data from many sources at once, transforming it, and sending it to a destination you choose. It is part of the Elastic Stack with Beats, Elasticsearch, and Kibana, and it is built for log and event transport plus general data processing.

It has over 200 plugins and supports writing your own plugins. The default plugin set includes 80+ plugins for connecting to multiple data sources, performing transformations, and sending results to Elasticsearch and other destinations. Official binaries and deb/rpm packages are available for supported platforms.

Logstash ships with Java and JRuby at its core, and plugins live in separate repositories under the logstash-plugins organization. The codebase mixes Elastic-Licensed X-Pack features with Apache 2.0 OSS code, so it is not fully OSI-open; an OSS=true build runs the Apache-licensed parts only. You self-manage the install from binaries or deb/rpm packages.