The 0.40 version of wxMUN for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free Mac application is a product of Geert-Jan Besjes. The software relates to Communication Tools. We recommend checking the downloaded files with any free antivirus.
From the developer:
wxMUN is a tool that lets you manage Model United Nations (MUN) debates, fully written in C++ using the wxWidgets toolkit. Like most open-source software packages, wxMUN is technically always under development, but it should be safe to grab the source code and try to build your own version if you're interested.
You may want to check out more Mac applications, such as MySpaceIM, ISL Pronto or Instant Messaging, which might be related to wxMUN.