Mersennator comes with ABSOLUTELY NO WARRANTY. This is free software, and you are welcome to redistribute it under certain conditions, in compliance with the GNU General Public License; see documentation for details.
Glucas 2.9 (already included in the Mac OS X version)
A Java 1.3 virtual machine.
Mac OS X users: Apple's JVM is built-in (Mac OS X 10.1 with 'Java 1.3.1 Update 1' or later). Windows, Linux x86, Solaris SPARC and x86 users:download the J2SE. Linux PPC users: try the Blackdown's Java Platform 2 for Linux.