The Eclipse Platform is designed for building integrated development
environments (IDEs) that can be extended by custom plug-ins. The base
distribution also contains a full-featured Java development
environment.

NOTE: Although it runs with the open source gcj Java, it is advisable
to install SUN's, IBM's or BEA's Java
(java-1_4_2-sun,java-1_5_0-sun,java-1_4_2-ibm, java-1_5_0-ibm or
java-1_4_2-bea) due to performance reasons.