AppFresh updates your software. You can check it on your external drives for software updates. It lists plug-ins, Mac app store apps and third party apps.
I tried out this AppFresh a while ago and it made a few errors such as telling me a few Mac Apps were in need of updating. But when I checked the publisher of the Apps website, I found that AppFresh had made an error on more than one occasion.Why to pay to use an error-prone AppFresh?
