You do not need any additional software. On Linux you can mount an ISO in a similar (not exactly the same way) you can manually mount a storage device.
Example:
Create a mount point. Which is a folder from which the device or in this case ISO that you mount will be browseable from.
sudo mkdir /mnt/iso
Mount the ISO.
sudo mount -o loop /home/harvey/Downloads/whatever.iso /mnt/iso
You can now browse the contents by navigating to /mnt/iso
When you are finished you can unmount the ISO like so:
sudo umount /mnt/iso
Note that the ISO will be mounted read-only and rebooting or shutting down your system would automatically unmount the ISO and it will not automatically mount it again next boot. You would have to rerun the command to mount it again.