eXe is an open source content authoring tool which works on both PCs and Macs. It has been developed in New Zealand and is free to download. It's reasonably straight forward to use and there are some helpful screencasts on the site which give you an overview of how to use the tool.
"Collectively, the 22 participant surveyed conveyed an averaged positive feedback score of 84 percent across the aforementioned feedback domains-with a mean score on the modified four-point Likert scale of 3.25."
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