ChatSecure 5.0.4 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free software for Mac OS X was originally produced by Chris Ballinger. The application relates to Communication Tools. We recommend checking the downloaded files with any free antivirus.
From the developer:
ChatSecure is a free and open source messaging app that features OTR encryption over XMPP. You can connect to an existing Google account, create new accounts on public XMPP servers, or even connect to your own server for extra security.
Unlike other apps that keep you stuck in their walled garden, ChatSecure is fully interoperable with other clients that support OTR and XMPP, such as Adium, Jitsi, and more.
You may want to check out more software for Mac, such as KeySync, which might be related to ChatSecure.