sandboxie-plus.com
Sandboxie-Plus is open source sandbox-based isolation software for 32-bit and 64-bit Windows NT-based operating systems. It creates an isolated operating environment in which applications can be run or installed without permanently modifying the local or mapped drive, allowing controlled testing of untrusted programs and web surfing. Development has continued under David Xanatos since the project became open source. Two builds exist: Classic with an MFC-based UI and Plus with a Qt-based UI.