Bird Bell download

A Twitter audience notifier that resides in the menu bar.
No download links available

Alternatives to Bird Bell

Echofon for Twitter
FREE
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Echofon is an easy to use, super-fast Twitter app for the iPhone and iPod Touch.

Growl
FREE
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It allows applications that support Growl to send you notifications.

OmniGrowl
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OmniGrowl provides many practical notifications through Growl in a single application.