Ventoy

Ventoy changes the bootable-USB game: install it once to a stick, then just copy ISO files onto the drive like normal files — at boot, a menu lists every ISO and boots your pick. Windows installers, a dozen distro ISOs, rescue tools, all on one stick, updated by drag-and-drop. It handles Secure Boot (with an enrollment step) and both BIOS/UEFI.

Rare ISOs misbehave with its chainloading and need workarounds or a traditionally-flashed stick — worth keeping dd or Fedora Media Writer in your back pocket for stubborn cases. The project’s build process drew some supply-chain scrutiny in security discussions (bundled binary blobs), which the maintainer has been addressing; weigh that if your threat model is strict. For daily multiboot convenience, nothing touches it.