Choose-OS (chos), is a modular and configurable boot loader for Linux/x86 - a program that is loaded by the BIOS before any operating systems. This program then lets you choose the operating system to boot and possibly enter parameters to it
Grub with IPMI WDT is an enhanced version of the Grub boot loader. This Grub provides a function to monitor hung-up during OS boot. The function made it possible by activating IPMI WDT before the kernel image is loaded.
Small Linux from Network is a little Linux distro loaded from a network connection using a modified version of the DrakX (Mandriva Linux installer) loader. The OS image can be loaded from an HTTP, FTP or NFS server.