When we caught up with educator Dave Riddell on Twitter the other day, he was looking for a new low-cost tool to create and edit PDF files — the web's default format for sharing printable documents. Here, for the benefit of other Macintosh users, he shares his picks for free open-source PDF software. PDF Tools for Mac As an educator, I spend a significant amount of my time immersed in articles and reports as part of my research for grant writing, and curriculum and project development. I try and
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