» Log Analyzers
AWStats - Free (open-source) log analyzer generating web server statistics (as well as FTP and mail server statistics) graphically. It works either from a command line or as a CGI and is fast and efficient. One of the most popular (free) log analyzers.
Log Parser - Free. "Log parser is a powerful, versatile tool that provides universal query access to text-based data such as log files, XML files and CSV files, as well as key data sources on the Windows operating system such as the Event Log, the Registry, the file system, and Active Directory. You tell Log Parser what information you need and how you want it processed. The results of your query can be custom-formatted in text based output, or they can be persisted to more specialty targets like SQL, SYSLOG, or a chart. Most software is designed to accomplish a limited number of specific tasks. Log Parser is different... the number of ways it can be used is limited only by the needs and imagination of the user. The world is your database with Log Parser."
WebTrends - Commercial.
Sawmill - Commercial.
Surfstats - Commercial.
123LogAnalyzer - Commercial.
WhosOn - Commercial, that can be used to watch live web stats and monitor real time visitor activity.
» URL Rewriting
Mod Rewrite - ISAPI filter based on regular expressions. Free and open source.
ISAPI_Rewrite - ISAPI filter written in C/C++ and is based on regular expressions. Besides URL rewriting, it can also block hot linking, proxy content, create dynamic host-header based sites and more. Commercial, but a free lite version exists.
ISAPI Rewrite Filter - Open source ISAPI filter where the rewrite rules are specified using regular expressions.
» Password Protection
Mod_Auth - Password protects files and directories without the need to create Windows user accounts. Authorization can be done against a text file, MySQL or any OleDB supported database. Free and open source.
iisPROTECT - Password protects all file types, independent of Windows user accounts. Commercial.