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Sparkle is an easy-to-use software update framework for Cocoa developers. It features:
★True self-updating--no work required from the user.
★Uses appcasts for release information.
★Displays release notes to the user via WebKit.
★The user can choose to automatically download and install all updates.
★Displays a detailed progress window to the user.
★Seamless integration—there's no mention of Sparkle; your icons and app name are used.
★Supports authentication for installing in secure locations.
★Supports DSA signatures for ultra-secure updates.
★Really, really easy to install.
★Sparkle requires no code in your app, so it's trivial to upgrade or remove the module.