AMPL
AMPL modeling language and system for formulating, solving and analyzing large-scale optimization (mathematical programming) problems.

Candleweb and Å
Introducing CandleWeb and Å (awe), bringing animation power to the World Wide Web.

Catalog of Free Compilers and Interpreters
Catalog of Free Compilers and Interpreteers: introduction

Cel
Cel Programming Language

Code Beach
Code Beach is your complete guide to free and open source code for ASP, C++, C#, ColdFusion, Java, JavaScript, Palm, Perl, PHP, Pocket PC, Python, and Visual Basic.

Codepile
Ultimate source code collection for programmers. Examples, samples, source codes. All for professional developers.

Design By Numbers
Design By Numbers

DevX
The leading online information service for Visual Basic, Java, C++, Enterprise, and Internet developers.

Developer's Resource Series
Developer's Resource Series