Monal 5.1 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. We recommend checking the downloaded files with any free antivirus. Monal for Mac relates to Communication Tools. This free software for Mac OS X was originally designed by Anurodh Pokharel.
From the developer:
Monal allows you to connect to your chat server without having to give a third party access to your password or messages. Whether it is a personal Google talk account or a corporate chat server, it is important not to give someone access to sensitive information. This app has no ads, no user behavior tracking and all messages are exchanged directly with the XMPP chat server.
You may want to check out more Mac applications, such as MySpaceIM, ISL Pronto or Instant Messaging, which might be related to Monal.