Zoom is a graphical Z-machine and Glulx interpreter written by Andrew Hunter. It's available for Linux / Unix and Mac OSX.
The Zoom interpreter is a signatory to the Treaty of Babel. The iFiction format, originally created for Zoom, is one of the key standards adopted by the Treaty, and is documented in section 5 of the Treaty.
As of March 2012 the latest version of Zoom for Mac is 1.1.5.
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TODO: More details, please. What are Zoom's features (pros and cons)? History of development and support?