- GNUwin32 package of flex. (Oh! btw, I started off on windows. 'cuz we need it both on Windows nd Linux and I know it will surely work in Linux as I've used flex/bison in Linux before.)
- lex & yacc, Second Edition
Apache Reference Online:
This is the website. Most of the pages are in German; but you can make out.
The specific presentation I was talking about are here:
Then, there is http://f-m-c.org/projects/apache/index.php . This was the output of a project by the same university.
For Apache Filters,
Specifically about output filters:
About bucket brigades:
Many other articles by Ryan Bloom (the APR guy)