Industrial strength word-processing program
Spreadsheets
(Lots of) dictionaries, among them: Medical Dictionary of Regulatory Activities (MedDRA); World Health Organization Drug Dictionary (WHO Drug); and Clinical Data Interchange Standards Consortium (CDISC database)
Innumerable style guides, such as: AMA Manual of Style, Chicago Manual of Style, "eccentricities of a sponsor's style”
Computers
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Kind of, Sort of, Semi-Related Careers: