Zoom is a Z-Machine, which means that it plays text adventure games written in ZCode. The original games were written by a company called 'Infocom' in the 80's: these are available on the Infocom Masterpieces CD, published by Activision. Unfortunately, Activision seems to have lost interest in this title - however, there are a few companies that have a stock of this CD (I bought mine from here).
In around 1993, a compiler called Inform was released that allowed ordinary mortals to create their own ZCode adventures. This sparked quite a revival, and there are many games available
- This version fixes several issues relating to Snow Leopard and Lion, and updates the git and glulxe interpreters to the latest versions