Diction and style are two old standard Unix commands. Diction identifies wordy and commonly misused phrases. Style analyses surface characteristics of a document, including sentence length and other readability measures. These programs cannot help you structure a document well, but they can help to avoid poor wording and compare the readability (not the understandability!) of your documents with others. Both commands support English and German documents.
WWW: https://www.gnu.org/software/diction/
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