I wrote this great authentication module for Apache using SQLite3 for the password storage. I know that it works quite well on the 2.0 series of Apache, and it should work on the 1.3 series. I know that it doesn't yet work on the 2.2 series, which uses a different authentication structure.

If you are using Apache 2.2, you don't need this module. The authnz_dbm module has all of the functionality built in.

This module is provided free for public use, be that commercial or otherwise.