Chatra 2.1 for Mac is available as a free download on our application library. The software lies within Communication Tools, more precisely Texting & Video calls.
From the developer:
Chatra is a live chat and offline messaging application that allows you to talk with visitors on your website. You can chat with your website visitors in real time to answer questions and alleviate concerns more easily, building relationships with your visitors and helping them become customers.
You may want to check out more software for Mac, such as jIRCii, MySpaceIM or Instant Messaging, which might be related to Chatra.