Hi i would like to find out what is the latest software for an apple G4 Emac computer.

SOURCE: Network a G4 (OS 9) to a eMac (OS X)

Providing your G4 has its own monitor and both computers are up and running, the only thing you will be able to do with your crossover cable is file sharing, etc. You will be creating a LAN between the two.

SOURCE: eMac freezes quickly and regularly after startup

A number of eMacs and iMacs were build with a shipment of faulty capacitors. Your symptoms are consistent with this problem
http://macktez.com/help/001933.html
Apple had an extended free repair program to fix these failures within three years of purchase, but the program expired because it's been more than three years since the last one was sold.
Turn your eMac over, remove the bottom door, and look at the tops of the two can capacitors you can see through the door. If the lines on the bottom of the capacitors form a K instead of a +, they are likely to be from the bad batch. If there is any brown crud or ooze anywhere in those lines or elsewhere on the can, the capacitors are visibly failed.

Testimonial: "Hi thanks, this is exactly the problem I had, as was pointed out in a previous reply. Had it fixed a while ago and the eMac is up and running again:-)"

SOURCE: what kind of hard drive do i need for a apple emac

hi,

you can use either Maxtor or Seagate.

Regards

Testimonial: "thanks! just got this apple and need a hard drive and software"