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List of Alternatives to Adobe Programs
(feddit.org)
This is a most excellent place for technology news and articles.
In AEC work we’ve moved almost exclusively to a competing PDF tool called Blubeam, which is proprietary but very worth the price, with tools for scaling, dimensioning, and producing material takeoffs from PDF drawings. Much of what you’d use Acrobat for in a more typical office environment are absent or limited, though.