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Maybe FirePHP is what you are looking for https://github.com/firephp/firephp-core
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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If you need something more flexible you could always use Monolog which provides a bunch of adapters to log to any service want. You could for example use the syslog adapter to send your logs to syslog, and then configure rsyslog to print them directly into your terminal (or just `tail -f` a log file).
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.