Download of coconutWiFi 3.0 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this free Mac application is coconut-flavour. The application is included in Internet & Network Tools. We recommend checking the downloaded files with any free antivirus.
From the developer:
coconutWiFi displays you a small aqua-bubble at the top of your screen which indicates whether you're in range of a wireless network or not. The app also tells you if the wireless networks in your range are encrypted or open, so you won't miss the next open wireless network any more. It also shows up information about the found networks like the channel number or the bssid.
You may want to check out more software for Mac, such as WiFi Coconut, which might be similar to coconutWiFi.