Java Links

http://java.sun.com/j2se/ - Sun's Java Development Kit (JDK)
http://java.sun.com - Official site of Java
http://www.javaworld.com - Tutorials, tips and tricks, etc
http://www.javaboutique.com - Applets, sample code, etc
http://www.omnicore.com - IMHO the best Java IDE there is in the world

Development Environments

Java IDE, CodeGuide - The Java Development environment I use for my profession. The best I've tested, and believe me I did a lot of testing before I choosed this one.Is supported on all major plattforms, Linux, Windows, Macintosh.

Pascal F-Print - A good Pascal compiler and IDE for OS/2, Windows, and also Linux (Linux is a third party enhancement to the compiler).
Virtual Pascal resembles very much of Borland's MS-DOS Development Environment (IDE). This compiler is free of charge.

Links for Linux OS

Sunets application archive - A large application archive and mirror for a lot of operating system, such as Unix and dialects.
Linux official webpage - Does this really need any intro?
Swedish Linux User group - A Linux UserGroup in Sweden, Stockholm. They have among other things their own newsgroups

Links for OS/2

Norloffs OS/2 bbs - A really good application site for OS/2 users
OS/2 Supersite - Lot of good stuffs for every OS/2 user(applications, news, links, etc)

OS/2's official website at IBM - The company behind the superb operating system OS/2
OS/2 Swedish User Group - The swedish OS/2 user group, this site has a lot of interesting things for swedish OS/2 users