The grand-daddy of spreadsheets, and still available today in its original glory: VisiCalc Executable for the IBM PC.
Another early spreadsheet was Multiplan, which really was quite advanced for its day, offering linked sheets and other powerful concepts. See A Brief History of Spreadsheets
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Inexpensive and informative Apple related e-books:
Take Control of iCloud, Fifth Edition
Take Control of Pages
Take Control of Upgrading to Yosemite
Take Control of the Mac Command Line with Terminal, Second Edition
Take Control of Parallels Desktop 12