Logstash is completely free to use.
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Write a ReviewLogstash is free and open source from Elastic. It's part of the ELK stack that many organizations run without licensing costs.
Logstash is a data processing pipeline that collects, transforms, and sends logs to various destinations. It's the 'L' in the ELK (Elasticsearch, Logstash, Kibana) stack.
Logstash has richer transformation plugins. Fluentd is lighter and more efficient on resources. Both are excellent log processing tools.