@LightBulbFun (project master), @bunnspecial, @tevion5, @MacCubed, @iModFrenzy, @128keaton and I (all members of my MR iMessage Group Chat, along with @keremtezcan and @CYB3RBRITE) are all actively working on hacking Leopard 10.5.8 onto G3s. We are attempting to use the .kext files and kernal from the early OS X Leopard WWDC 2006 Preview (which could be run on a G3 natively) and combining them with the kexts from 10.5.8 to allow it to run on a G3. So far, we have determined that Build 9A303 is (as far as we know) the last version to boot on a G3. Build 9A231 will boot almost to the login screen, but we're not sure if this is due to using an emulator (@LightBulbFun is a bit limited with his resources). We also know that by Build 9A466, G3 support was dropped. That's all we have for now, and we'd always appreciate any help if anyone wants to join us. We will be updating this thread with any new breakthroughs we reach or any news on the project.