Available for iOS devices (not sure about the others)

TagDisk : It does two things well, and thats downloading videos from youtube and unraring files. Other than that it's just your basic browser with the ability to download various files from the internet onto your iOS device. But, still worth the download.

iSafePod : This app could've been better if it had the ability to unrar files but it does everything else so well that I can't really complain. First off you have a passcode and a fakecode (use the fakecode to keep certain files from being viewed) *hint* *hint* You can also download various files from the internet "including" videos off of youtube straight to your iOS device. This app also has a built in video converter to convert videos to mp4 format, and an audio extracter to extract audio from videos then save it to aac format. Overall a solid app and one of the best browser experiences I've had so far from the app store.

Day One : Not one of the best journal apps out there and certainly not the worst either. I would like to see more features but as it stands it is a good journal writing app. Very similar to Momento but there is no option for adding pictures to your entry, but its soft blue and black layout is easy on the eyes. Worth taking a look if none of the others are working for you.