Clover is open source based on different projects: Clover, rEFIt, XNU, VirtualBox. The main is EDK2 latest revision.

https://github.com/CloverHackyColor/CloverBootloader

Main features:

• Boot into macOS 10.xx, Windows EFI and Linux EFI;
• It's EFI bootloader provides RuntimeServices for OS that impossible for Legacy Bootloaders;
• Mostly Clover do automatic detection of hardware and set all properties by default. But user can change them by editing config.plist;
• With Clover you may restart into other OS from Startup Disk pane in System preferences;
• UUID written into config.plist will be the same as in OS;
• SMBIOS will be corrected to standard 2.6;
• ACPI will be corrected to standard 4.0;
• Custom DSDT will be loaded from booted partition or from EFI folder;
• DSDT patching on the fly by fixes and by patterns;
• Customizable RestartFix and Sleep/Wake fixes and PCIRootUID value;
• Graphics Properties Injector for ATI, NVidia and Intel for wide range of supported cards. Also customizable;
• USB fix (LegacyOff, Ownership, Builtin, clock-id) up to USB 3.0;
• HDA injector and Ethernet builtin injector;
• CPU turbo and P- and C-states generator;
• ACPI tables loading (SSDT-xx, APIC, BOOT, SLIC, SLIT, SRAT, UEFI...);
• Extra kernel extensions loading;
• Kernel and kext patching on the fly;
• Set NVRAM variables for different purpose;
• Default boot after timeout, customizable GUI, saving screenshots from GUI typing F10;
• Saving boot.log in OS and preboot.log from GUI by typing F2.