Blog about a Locker of Awk code: http://awk.info
Steve Coile's XML parser (uses off-the-shelf Awk).
Landauer and Hirakaw use Awk for Programming-by-Demonstration
Bob Orlando's date manipulation routines.
New section: Awk and Music
Awk100#22: Stephen Jungels' music player
David Huron's Humdrum music analysis toolkit
XML: dealing with DTDs.
New section: Awk for engineering
David Leo's mechanical engineering library.
Eiso Ab's chemical engineering library.