Windows: Panda Cloud, the constantly updated, cloud-run antivirus app that promises almost real-time protection from burgeoning web threats, is out of beta and available for a free download.
As the How-To Geek detailed in his beta write-up, Panda does most of its computing, file-checking and threat-updating on its servers, leaving a very light and agile app presence on your system. It caches its threat database offline with a minimal bit of hard-drive space, and the interface is far from cluttered, as you see above. In general, it's a very polite antivirus app, and if the Geek considers it worth mentioning, well — he's far from calmly objective on the topic of antivirus apps, so consider it a recommendation.
During the beta process, Panda appears to have focused on tightening up CPU and memory usage even more, as well as fixing the "stuck" errors encountered by some users. If you're already running a beta, Panda recommends uninstalling that and installing the 1.0 final.
Panda Cloud Antivirus is a free download for home users and educational groups on Windows systems only.