GNU GRUB is described as 'Multiboot boot loader. It was derived from GRUB, the GRand Unified Bootloader, which was originally designed and implemented by Erich Stefan Boleyn' and is a very popular Boot Manager in the os & utilities category. There are more than 10 alternatives to GNU GRUB for Windows, Linux, Mac and BSD. The best GNU GRUB alternative is rEFInd - Boot Manager, which is both free and Open Source. Other great apps like GNU GRUB are Libreboot, Limine, Grub2Win and Clover EFI bootloader.
Quibble is the custom Windows bootloader - an open-source reimplementation of the files bootmgfw.efi and winload.efi, able to boot versions of Windows from XP to Windows 10 22H2. Unlike the official bootloader, it is extensible, allowing you to boot from other filesystems than...
rEFIt is a boot menu and maintenance toolkit for EFI-based machines like the Intel Macs. You can use it to boot multiple operating systems easily, including triple-boot setups with Boot Camp. It also provides an easy way to enter and explore the EFI pre-boot environment.
The development of LILO as classic bootloader for GNU/Linux systems was restarted in June 2010. Because of the simpleness LILO has some advantages comparing with Grub and Grub2. But nowadays LILO is not the bootloader for all situations. But LILO is longtime proved and stable.
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.
Written in C++ and licensed under GNU GPL, XOSL (eXtended Operating System Loader) is a user-friendly, window-based graphical boot manager handling large disks and over 30 different operating systems.
Yaboot is a PowerPC bootloader for Open Firmware based machines including New World Apple Macintosh, IBM RS/6000, IBM pSeries and IBM OpenPower machines.
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