You could have downloaded MyDictionary 2.18 for Mac from our software library for free. The actual developer of this software for Mac is myossoftware. The application is categorized as Education Tools.
From the developer:
MyDictionary is an online language translator for your Mac. All you need to do is enter the text you wish to translate and select the target language. Consequently, the text will be automatically translated into the desired language. An Internet connection is required, since the app supports services like Google, Microsoft, Yandex, Promt, and SDL. You can save the translation to clipboard with a click of a button.
You may want to check out more software for Mac, such as Just Translate, Infovox iVox or SpeakToMe, which might be related to MyDictionary.