Libreboot is described as 'Free software project based on coreboot, aimed at replacing the proprietary BIOS firmware contained by most computers. Libreboot is a lightweight system designed to perform only the minimum number of tasks necessary to load and' and is a Boot Manager in the os & utilities category. There are seven alternatives to Libreboot for a variety of platforms, including Linux, Windows, Mac, BSD and Haiku apps. The best Libreboot alternative is GNU GRUB, which is both free and Open Source. Other great apps like Libreboot are coreboot, iReboot, Das U-Boot and Chimera.
GNU GRUB is a multiboot boot loader. It was derived from GRUB, the GRand Unified Bootloader, which was originally designed and implemented by Erich Stefan Boleyn.
iReboot is NeoSmart Technologies' simple yet effective reboot helper tool. iReboot sits in your taskbar at startup (only taking up 400KB of memory!) and lets you choose which operating system you want to reboot into.
The "Universal Bootloader" ("Das U-Boot"), commonly shortened to U-Boot, is an open source primary bootloader for embedded systems.
Chimera is a Hackintosh bootloader that merges the best features from various branches of Chameleon bootloader, into a new branch based on the latest Chameleon 2.0 RC5 trunk version. It is designed for maximum compatibility across platforms.
XTIDE Universal BIOS makes it possible to use modern large ATA hard disks or Compact Flash cards on old PC's. You can then enjoy quiet or noiseless drives with more capacity than you'll ever need for old computers.
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GRUB is a boot loader while Libreboot is a BIOS replacement (which starts before the bootloader)