Free jQuery OS Plugins
All the Free jQuery Plugins about 'OS' are listed here.
Depend is a jQuery browser & platform detection plugin to detect client browser (type and version), OS, device type, and other util information using the user agent.
A small browser detection plugin that detects browser/platform/engine information using the user agent and adds related CSS classes to the html element.
jQuery Browsers is a simple plugin that allows to get client's OS and Browser details and then output them on your screen.