Wickr
Wickr 2.6.1 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. The application lies within Communication Tools, more precisely Texting & Video calls. This free software for Mac OS X is a product of Wickr Inc. We recommend checking the downloaded files with any free antivirus.
From the developer:
Wickr is designed to help you send and receive top-secret messages, pictures, documents, video and audio files. The application allows you to share unlimited photos, text, video, voice, or PDFs attachments. You can select a specific time for your messages and media files to expire. The tool lets you chat securely with groups of up to 10 users.
You may want to check out more Mac applications, such as WickrMe or WickrPro, which might be related to Wickr.
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