Ettercap for OSX 0.6 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. Ettercap for OSX for Mac relates to Internet & Network Tools. The actual developer of this free Mac application is Fork Networking. We recommend checking the downloaded files with any free antivirus.
From the developer:
Ettercap is a multipurpose sniffer/interceptor/logger for switched LAN. It supports active and passive dissection of many protocols (even ciphered ones) and includes many feature for network and host analysis. Decodes SSH1 on the fly.
You may want to check out more Mac applications, such as MPlayer OSX Extended, QuickShow OSX or Same OSX, which might be similar to Ettercap for OSX.
Network Tools