Problems

• Bay Area Math Olympiad
• Great Plains Math League
• Pomona College/Univ. of Wisconsin Talent Search
• South Africa Math Olympiad
• University of Maryland Math Contest

Software

• MathType
• Maplesoft
• The Geometer's Sketchpad
   

Resources for Women

• Women's Technology Program at MIT
• Study.com Scholarships for Women in STEM
• Women in Cryptocurrency and Blockchain
• A Guide for Women in STEM: Closing the Gender Gap
• Changing the Curve: Women in Computing
• Computer Science and Engineering Resources for Women in STEM
• Bridging the Gender Gap in STEM with Remote Work
• Resources for Women in Computer Technology
• Career and College Guide for Women in STEM
• Guide for Women in Computer Science: History, Roles, and Resources

Links

• AMATYC's "How to Study to Learn" videos
• College & Career Guide for Underrepresented Students in STEM
• Computer Science Before College
• Thinking Mathematics
• what-if.xkcd.com
• Megaconverter
• Natural Math
• Good Calculators
• Mathematical Modeling Handbook by SIAM
• WolframAlpha
• The Art of Problem-Solving Website
• Math Forum
• Johns Hopkins University Center for Talented Youth
• Eric Weisstein's World of Mathematics
• MacTutor History of Mathematics
• AMATYC's Student Math League Competition
• AMATYC's Student Research League