Ansible role which installs and configures Graylog
Fluentd: Unified Logging Layer (project under CNCF)
Qualitis is a one-stop data quality management platform
Elasticsearch/Splunk/Datadog alternative for (logs, metrics, traces)
Apache Log Parser and Data Normalization Application
A fake log generator for common log formats
Extensible log shipper with input/output plugins, buffering, etc.
Sematext Logs Client Library for Android
Log Management Web Application