Users of ReAssure can test dangerous or experimental software, including worms, viruses, and vulnerability scanners that use exploits, in an isolated environment. The system allows users to run experiments without setting up their own machines, and to test new servers and network configurations before they are deployed.

ReAssure also allows storing of public images of virtual machines for quick use on ReAssure. Whether they are appliances or simply interesting setups, images can be shared with the public or with a pre-selected set of users. ReAssure is compatible with images created by others, including the virtual appliances available for download at VMware’s Virtual Appliance Marketplace.

ReAssure provides a bank of 21 networked PCs running VMware. Users can run experiments on a single PC without network configuration, or upload an XML configuration file that specifies which software images to transfer on which PCs and how to network the PCs together. Experiments can also be scheduled ahead of time, and will start and finish at a time designated by the user.

ReAssure is open to the public and available to everyone. All software developed for the project is available as open source.