I was looking for a statistics cheatsheet for students and found this free site:
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"Cheatography is a collection of 5546 cheat sheets and quick references in 25 languages for everything from history to programming!" Top tags include: Linux (202), Development (147), Python (138), Nursing (130), Selenium (128), Programming (109), Pharmacology (86), Biology (77), Web (76), and Vim (72). FTop ten languages: English (4176), español (Spanish) (177), français (French) (162), Deutsch (German) (152), bahasa Melayu, بهاس ملايو (Malay) (60), język polski, polszczyzna (Polish) (49), português (Portuguese) (40), русский язык (Russian) (36), 中文 (Zhōngwén), 汉语, 漢語 (Chinese) (34), Nederlands, Vlaams (Dutch) (24). riendly format, easy to navigate, and plenty of support.