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Logparser - Command line parser for common log format (Nginx default).
LogTailApp - LogTail is a local and remote (SSH) log file viewer and monitoring application for Mac OS X. It is a pure, modern, document-based Cocoa App
observIQ Cloud - The intuitive log management platform that you actually want to use.
Bulletlog - Aggregate logs, discover and fix errors in real time
Loggly - The world's most popular cloud log management service delivers application intelligence. No Software. No Downloads. No Sweat. Free Trial!
logstash - logstash is a tool for managing events and logs.