Propane is a Mac tool that uses the Campfire network within a desktop client. Campfire is a chat system that you can use privately, within your company, to enable colleagues to chat, share files and track projects. Problem is that Campfire is a web-only project and you won't want to keep opening your browser to chat to other users. Step up Propane which brings these features within a desktop client. Ideal, although it would be far better if the author had produced a cross-platform version, perhaps using Adobe Air?
Propane for Mac link.
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