Kraken BItcoin Ticker displays the current BTC exchange rate on your status bar.
Download on the Mac App Store

Alternative apps

Bisq
Bisq
FREE
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Buy and sell bitcoins in exchange for national currencies.

Universal Ticker
Universal Ticker
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Universal Ticker - Resize your ticker window to any height you want.

BTCPrice
BTCPrice
FREE
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Simple application that displays the latest bitcoin price.

Bitcoin-XT
Bitcoin-XT
FREE
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Bitcoin-XT works as a patch set on top of Bitcoin Core.

Coinffeine
Coinffeine
FREE
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Next-gen bitcoin exchange application.