Software by BitStrike Software:

Web Log Mixer is a GUI/command line utility which helps you to combine log files generated by the web server into a single log file. Source log files can be generated either by a single web server or by different web servers in the load balancing environment. The program understands log files compressed with zip, gzip or bzip2 and can compress destination log file with gzip or bzip2.

Absolute Log Analyzer is a powerful log analysis tool for large websites (unlimited domains). Created by and for professional webmasters, this application features over 160 detailed reports, instant customizable filters, parsing filters, and remote import via FTP/HTTP. The database is kept, so you can track your websites progress and make intelligent marketing decisions. Retail price is only $150; feature-limited demo is available.