This might seem like an odd request: There are some classic and early OSX apps which I really enjoyed using and I would like to revive. Is there an emulator which can run the versions of MacOSX Tiger created to run on computers with PPC architecture?
It is now possible to emulate PowerPC for Mac OS 9.2.2 through 10.5 via QEMU: https://wiki.qemu.org/Documentation/GuestOperatingSystems/MacOS10.4 and https://wiki.qemu.org/Documentation/Platforms/PowerPC.
You'll need to install homebrew, a package manager for Mac OS X/OS X/macOS. Then run
brew install qemu (which already contains the PowerPC part).
To create the a hard disk image, run
qemu-img create -f qcow2 example.img 100M
example.imgwith the path you want to store your disk image in
100Mwith the size you want (at least 3.0GB to install Tiger according to Apple, probably about 10GB to be safe).
You could also use a sparse (bundle) disk image with QEMU (you'll then be able to natively mount it within the host) but that requires a bit of setup and a script.
You can run then Tiger with
qemu-system-ppc -L pc-bios -boot d -M mac99 -m 512 -hda example.img \ -cdrom <iso file of installation media> \ -netdev user,id=mynet0 -device sungem,netdev=mynet0 `
where is the ISO of a Tiger install disk (you could also use the disk directly as well as dmg images using the same method for a sparsebundle)