Downloading NavCoin-Qt 3.7.0.0 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. NavCoin-Qt for Mac relates to Business Tools. We recommend checking the downloaded files with any free antivirus. The actual developer of this free Mac application is NAV Coin.
From the developer:
NAV Coin is a digital currency which is based on Satoshi Nakamoto's open source Bitcoin Core. The system is peer-to-peer; users can transact directly without needing a centralized authority like a bank or credit card issuer to verify transactions. When a transaction takes place, it is recorded on a decentralized public ledger called a block chain.
You may want to check out more Mac applications, such as AccountingToolBox, Airfoil Speakers or instantAdmin, which might be similar to NavCoin-Qt.