http://en.m.wikipedia.org/wiki/VMware_Workstation
Get the software from the college full version and try it
Install all OS in one laptop (win7-win8.1-linux-others)
VMware Workstation is a hypervisor that runs on x64 computers; it enables users to set up one or more virtual machines (VMs) on a single physical machine, and use them simultaneously along with the actual machine. Each virtual machine can execute its own operating system, including versions of Microsoft Windows, Linux, BSD, and MS-DOS. VMware Workstation is developed and sold by VMware, Inc., a division of EMC Corporation.
VMware Workstation supports bridging existing host network adapters and share physical disk drives and USB devices with a virtual machine. In addition, it can simulate disk drives. It can mount an existing ISO image file into a virtual optical disc drive so that the virtual machine sees it as a real one. Likewise, virtual hard disk drives are made via .vmdk files.
VMware Workstation can save the state of a virtual machine (a "snapshot") at any instant. These snapshots can later be restored, effectively returning the virtual machine to the saved state.[4]
VMware Workstation includes the ability to designate multiple virtual machines as a team which can then be powered on, powered off, suspended or resumed as a single object, making it particularly useful for testing client-server environments.
The VMware Player, a virtualization package of basically similar, but reduced, functionality, is also available, and is free of charge for non-commercial use, or for distribution or other use by written agreement