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General

Documentation tool
Programmers Heaven
FunctionX - Tutorials

C/C++ Reference

C/C++ Reference

Java Reference

Java API (Sun)
Java Reference

Database Reference

MySQL

Perl Reference

Perl

PHP Reference

Php
Php quick reference
Php-Portalen
PHP Freaks
PHP Editors

HTML

NCD HTML Design Guide
Resources For Web Design

Script download

Hot scripts, a large collection of PHP, CGI, Perl, JavaScript and ASP script
Matt's Script Archive, Inc. :: Free Perl CGI Scripts
The CGI Resource Index
Resources for java (libraries)
Allthescripts
Zend/Developer Zone