Download of Magreo 1.1.4 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. We recommend checking the downloaded files with any free antivirus. The application lies within Communication Tools, more precisely Texting & Video calls. The actual developer of this free Mac application is Magreo.
From the developer:
Magreo is a fast voice messenger that allows you to instantly send voice messages to any person at any time. You can send short audio messages to friends and family very quickly so it is better than phone calls and faster than texting. You can also listen to saved messages at a later time.
You may want to check out more Mac applications, such as iChatMonitor, Instant Messaging or JabberFoX, which might be similar to Magreo.