Mac OS X: 10.3.x/10.2.x/10.1.x

G3 (G4 Reccommended for server)
128Meg Ram
300 Meg free Hard disk space
Java 1.4.x Linux:

Linux

Pentium II processor or better
128Meg Ram
300 Meg free Hard disk space
Java 1.3
glibc2.1, libncurses

Windows

Pentium II class processor or better
128Meg Ram
300 Meg free Hard disk space
Windows 98 second edition, NT 4.0, 2000, ME, XP home or professional, Internet Explorer 4.0 or higher