KQEMU is now free software!
As part of the 0.9.0 release, Fabrice Bellard released KQEMU under the GPL. KQEMU is an accelerator for QEMU that works on older hardware (without hardware virtualization). As part of this release, Fabrice also published detailed technical notes.
You can get the GPLv2 version of KQEMU here. I want to thank Fabrice for doing this. There are a lot of people in the QEMU community who are very happy about this.