AUMBI (Absolute USB MultiBoot Installer) is a free, portable app that allows you to have multiple Linux operating systems on a single USB (flash, thumb) drive.
AUMBI lays out installing an operating system in three easy steps.
Select a drive. You can show all devices optionally.
Select a distribution. You can optionally download the ISO if not on your drive.
Select the ISO.
Finally, you can click on Create.
Links are provided for the Home Page, FAQ, and recommended flash drives.
AUMBI has support for Spanish and English languages at this time.
We did find four VirusTotal hits. However, they are four of the word antivirus programs, and AUMBI is an unknown app in which inferior quality antivirus programs will flag using heuristics. We could not find anything malicious.