VirtualBox is packed with features that you may have never used, even if you frequently use it to run virtual machines. VMware keeps many of its best features to its paid versions, but all of VirtualBoxs features are completely free. Many of the features here require Guest Additions installed in your virtual machine. This is good to do anyway, as installing the Guest Additions package will speed up your virtual machines. Snapshots VirtualBox can create snapshots that save a virtual machines state. You can revert to the saved state at any time by restoring a snapshot. Snapshots are similar to leaving a virtual machine in a saved state, but you can have multiple saved states and restore from them at any time.