SmartShield is described as 'Allows administrators to ensure the ongoing integrity of their workstations without limiting usability. With SmartShield Protection enabled, all changes made to a workstation are removed with every restart. This makes unwanted system changes an impossibility' and is an app in the security & privacy category. There are more than 10 alternatives to SmartShield for Windows, Linux and Mac. The best SmartShield alternative is Deep Freeze. It's not free, so if you're looking for a free alternative, you could try Reboot Restore Rx or rdiff-backup. Other great apps like SmartShield are Shadow Defender, Duplicacy, ToolWiz Time Machine and Windows File History.
Similar featureset, lower priced than other solutions (Deep Freeze).