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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Maybe FirePHP is what you are looking for https://github.com/firephp/firephp-core
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.