ProStack is a convenient menubar app for OS X. It notifies you of new answers and comments from the whole StackExchange network (including StackOverflow, ServerFault and SuperUser), and provides quick access to StackExchange sites.
Requirements: OS X 10.6.8 or later, 64-bit processor.
DEVONagent Lite puts Web search where it belongs: next to Spotlight into your menu bar.
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