Visitors is a very fast web log analyzer for Linux, Windows, and other Unix-like operating systems. It takes as input a web server log file, and outputs statistics in form of different reports. The design principles are very different compared to other software of the same type: * No installation required, can process up to 150,000 lines of log entries per second in fast computers (20MB/s with my log files average length). * Designed to be executed by the command line, output html and text reports. The text report can be used in pipe to less to check web stats from ssh. * Support for real time statistics with the Visitors Stream Mode introduced with version 0.3. * To specify the log format is not needed at all. Works out of box with apache and most other web servers with a standard log format (see the documentation for more information on the format). * It's a portable C program, can be compiled on many different systems. * The produced html report doesn't contain images or external CSS, is self-contained, you can send it by email to users. * Visitors is free software (and of course, freeware), under the terms of the GPL license. You don't need to pay to use it.