after-kexec (ie. things you can boot with kexec)

• linux (obviously, since this was its original use-case)
• any Multiboot-compatible OS (Hurd, VMware, Xen)
• etherboot
• grub4dos (how? this way?)
  • Grub4dos can then chainload anything else. "Direct transition to DOS/Win9x from within Linux"

before-kexec (ie. to get things setup before booting)

• various kexec-based bootloaders
  • kboot
  • kexec-loader — it's able to read GRUB config files. It's also a somewhat standalone floppy-Linux-distro, insofar as it can boot up and do a minimal amount of work before kexecing
  • netbootcd — Tiny Core-based
  • petitboot [Playstation3]
  • pxe-kexec — mimics PXELINUX
  • runnix