Macros for Writers and Editors, by technical author, publisher, proofreader and editor Paul Beverley, is a free online book with over 400 macros for the writer, editor and proofreader.
One of my personal favourites is CiteCheck, which is excellent if you want to check text citations against a bibliography, particularly when the short-title system is being used. Other popular macros developed by Paul include the well-loved FRedit, a customizable scripted find-and-replace macro, and IStoIZ and IZtoIS (both of which highlight all the words in a file that may need amending to fit client style).
However, this blog post doesn't even begin to scratch the surface. Instead, take a look at the book yourself and decide what will work best for you. There really is something for everyone.
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