Sitecore Log Analyzer 1.2.0 rev. 120706 was superceded by the new version. You can find it on Marketplace.
Sitecore Log Analyzer is a powerful tool for parsing Sitecore log files. It provides the interface to explore and navigate through large amount of log data. For instance, you can group and analyze all errors, warnings, debug and audit messages logged by Sitecore application, monitor performance counters, and get a visual overview of website uptime and downtime intervals. The tool is designed for Sitecore developers who troubleshoot or monitor the health of Sitecore applications.