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

Main features:

boot into 10.xx macOS, 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 config.plist
with Clover you may restart into other OS from Startup Disk prefPane
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 kexts loading
kernel and kext patching on the fly
set NVRAM variables for different purpose
default boot after timeout, customizable GUI , and saving screenshots from GUI typing F10
saving boot.log in OS and preboot.log from GUI by typing F2