Java 2 SE 5.0 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software belongs to System Tools. We recommend checking the downloaded files with any free antivirus. This free Mac app is an intellectual property of Apple.
From the developer:
The Java 2 Platform Standard Edition (J2SE) 5.0 Release 1 software update provides support for cross-platform J2SE 5.0 applications and J2SE 5.0-based applets in Safari on Mac OS X 10.4 "Tiger."
This update does not change the default version of Java on your Mac from Java 1.4.2 to J2SE 5.0, though Java applications that require J2SE 5.0 may specifically request it.
You may want to check out more software for Mac, such as GStreamer Java, PDF2Office SE for iWork 2 or Strata Design 3D SE 7, which might be similar to Java 2 SE.