Webroot Software Inc. are the developers behind the popular security solution of the same name for desktops, and have brought the same protection to Android users with Webroot Mobile Security. This app, unlike its desktop counterpart, has features specifically for lost or stolen devices, giving the user the ability to track, lock, and wipe the device remotely from the handy online console.
At A Glance
Webroot Mobile Security has a free version and a paid version coming in at $14.99. The free version is only different in that its features list is more constrained than in the full version. I go back and forth on whether this app is worth the price -- on the one hand there are free apps that do much more for lost and stolen devices; on the other hand, Webroot is a trusted name, and the app comes with antivirus/malware protection and a handful of other features that I haven't seen combined with a security app yet.