Boot-US
7.3#3 in boot manager softwareFree planFree planLinuxWindows
VisitBoot-US may suit people who need to choose among existing operating systems on an x86 PC, including users running multiple independent Windows systems. Its free non-licensed use is limited to private PCs and public schools.
Petitboot may suit Linux users who need a bootloader with multiboot support and boot-entry editing. Platform-specific features depend on the system, and its documented implementations cover POWER with OPAL and ARM64 with efivarfs.