virtualbox.org

a)I like the simplicity of virtualbox and mainly it separates me from Other Systems Automaticaly.
b) Today I am trying QEMU on Ubuntu and Vbox Do they Clash?
c) Same question about Vmware etc...
Thanks
Sam

VirtualBox will not clash with Qemu and it you can have VMware installed in parallel as well. But never try to run a VMware VM in parallel to VirtualBox. Not sure about Qemu: As long as it operates without the Qemu kernel module, you can run Qemu in parallel to everything you can imagine. With the kernel module loaded, better don't run Qemu in parallel to VirtualBox or VMware.