Is there a Linux version of http://www.linuxliveusb.com/ for example?
A GUI way to creating a bootable USB stick.
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UNetbootin works on Linux. It also provides the option to download a distro as part of the process.
usb-creator-gtk is what I use for such tasks: http://en.wikipedia.org/wiki/Startup_Disk_Creator Timothy Martin's answer (UNetbootin) seems to be a better solution for you to use.
Many Linux distro's have a LiveCD ISO which you can dump with
dd directly to a USB stick. But a diffrent aproch which i like more is to use GRUB2 to boot LiveCD ISO directly, This will allow you to have several distos/tools on a single USB stick.
Google for Multi ISO GRUB2, and you'll find few tools a guides.
In addition to other suggestions,
bootiso is a friendly script to achieve such goal in seconds, securely.
curl -L https://rawgit.com/jsamr/bootiso/latest/bootiso -O chmod +x bootiso ./bootiso --help
Use it like this: