GRUB - Multiboot boot loader
EveryMac.com - EveryMac.com is an online website that provides complete details about every iPad, iPhone, Mac, iPod, and Mac clone made by apple.
Clover EFI bootloader - This is EFI-based bootloader for BIOS-based computers created as a replacement to EDK2/Duet...
Macsales.com - Macsales.com is the best-in-class online shop for people looking to upgrade the SSD, External Drives, Flash, RAM, and other components of their Apple devices.
Systemd-Boot - Systemd-Boot, formerly known as Gummiboot, is one of the simplest UEFI boot managers that lets you boot Linux and Windows in EFI mode even if the system is BIOS only supported.
Mac of all trades - Mac of all trades allows you to buy cheap refurbished Apple Computers and Laptops at the Lowest Prices with a Free Warranty, which covers the product in case of damages.