Toys and Tools for Programmers

Java

Sun: Java

Sun Microsystems owns the Java standard. You can download the various Java SDK's from this site, as well as find loads of tutorials, blueprints and code samples.

Jakarta Project

Awesome set of open source tools, utilities and frameworks for Java development. Among them: Tomcat servlet container, Struts web application framework, Log4J logging facility. The Ant build utility is a related project.

GExperts.com: Gel Java IDE

Gerald Nunn, legendary progenitor of the GExperts Delphi IDE add-on, has built this very powerful Java IDE in Delphi. Fast, small footprint, feature-packed, and free.

JBoss

Open source J2EE application server. Beware: as with all application servers, there are a number of proprietary extensions which will lock you in.