I recently upgraded from Snow Leopard to Yosemite. I found that when I try to install an application downloaded directly (instead of via the App Store) I get a warning. Some of my favorite apps, e.g. Coconut Battery, are not available in the App Store. Is there a general consensus about whether or not these are safe? Apple seems to discourage them by saying that a previously good app could have malware inserted, and the App Store would protect one from something like that. Thoughts?