...
A servlet container. There are many (Apache Tomcat, Apache Geronimo, GlassFish, and Jetty, to name a few). Though this section may be expanded later to Geronimo and/or Jetty, I'll be covering Apache Tomcat to start.
Tomcat
Geronimo
Jetty
Apache Tomcat is an open source software implementation of the Java Servlet and JavaServer Pages technologies. This is application that will run the servlets created through the DSpace deployment process.
Geronimo
Jetty
Eclipse IDE
This wiki page concerns setting up Eclipse, but there are others (which are more popular among DSpace developers). If you like, please browse to the pages on NetBeans (oracle site, dspace wiki) or IntelliJ (jetbrains site, dspace wiki).
...