What are some alternatives?
When comparing UltraISO and ImgBurn, you can also consider the following products
PowerISO - PowerISO is a virtual drive that allows users to encode, burn, mount, and even encrypt CDs, DVDs, and BDs. The software can be downloaded from many platforms and sites online.
CDBurnerXP - Free CD, DVD, ISO, HD-DVD and Blu-Ray burning software with multi-language interface. Everyone, even companies, can use it for free.
Brasero - Brasero is an application to burn CD/DVD for the Gnome Desktop.
WinCDEmu - WinCDEmu is an open-source CD/DVD/BD emulator.
InfraRecorder - Welcome to the home of InfraRecorder on the internet! InfraRecorder is a free CD /DVD burning solution for Microsoft Windows.
Virtual CloneDrive - Virtual CloneDrive works and behaves just like a physical CD/DVD/Blu-ray drive, although it only exists virtually.