for viewing pictures you can use Preview which is the Default picture viewer on a Mac.
For downloading video's, I use Safari or iTunes and if they need converting, I use HandBrake.
Good place to download apps would be the App Store, accessible via the App Store icon in the dock.
hi guys.. just want to ask if what apps you use for viewing pictures? and for downloading videos and converting videos.? and where or what site you use to download this apps?. thanks. hoping for your reply.