Java Generic Libraries (JGL)
Class libraries that extend JDK libraries, providing many commonly-used algorithms and data structures. By Recursion Software, Inc. [Commercial]
http://www.recursionsw.com/Products/jgl.html

The GUI Toolkit, Framework Page
a comprehensive reference on GUI toolkits, user interface frameworks, software libraries, class libraries,windowing APIs, and related software tools for GUI development.Lists GUI libraries categorized by languages,including C, C++, Java, Tcl, Lisp, Python, etc.Covers both free software and commercial software.
http://www.geocities.com/SiliconValley/Vista/7184/guitool.html

Todd Veldhuizen @ Chalmers
Has study, Active Libraries and Universal Languages, on libraries active in compiling; rather than make unique languages for each purpose, build libraries to give domain-specific syntax, optimizations, safety checking; extant languages and compilers lack abilities needed for this.
http://www.cs.chalmers.se/~tveldhui/

RudeServer C++ Libraries
Professional Open Source C++ CGI Libraries
http://www.rudeserver.com/

PHP Class Libraries
Libraries for daily use. The Author of the site keeps porting PERL modules to PHP.
http://www.thewebmasters.net/

The Available C++ Libraries FAQ
Listing with descriptions of a large number of C++ libraries, both commercial and free.
http://www.trumphurst.com/cpplibs1.html

Chilkat C++ Libraries
Chilkat C++ Libraries for Microsoft Visual C++ 6.0, 7.0, and 8.0
http://www.chilkatsoft.com/cpp_libraries.asp

Available C++ Libraries FAQ
Includes a list of available C++ libraries, both public domain and commercial.
http://www.faqs.org/faqs/C++-faq/libraries/

Africana Libraries Newsletter
Michigan State University Libraries
http://www.lib.msu.edu/lauer/aln/

ARL Annual Salary Survey
Association of Research Libraries compiles data covering 12,000 professional positions in ARL libraries.
http://www.arl.org/stats/salary