Hi DavidR.
One could think of Immunet Protect. Immunet Protect is a free cloud-based security solution that uses the power of community to layer its protections that can be used alongside an existing resident av-solution.
But you know what our avast-moderator, Vlk, thinks about that in-the-cloud product as it uses (parasitically as he considers it) the combined protection of the av solutions of the users in the Immunet Protect Cloud, without doing much to achieve these results. However it could be used as an additional protection layer,
polonus