Maple Stuff:

• MapleSoft Homepage

Pi Day:

• A History of Pi
• Math Forum: Activities For Pi Day

Math Puzzles:

• Sudoku Tutorial
• Sudoku Kingdom: Free Online Puzzles
• Krazy Dad: Free Printable Puzzles, Puzzle Blog, and More

Archives:

Fractals:

• Fractal Images By Sharon Webb

Mathematical Associations:

• CMC^3: California Mathematics Council Community Colleges
• AMATYC: American Mathematical Association of Two-Year Colleges
• MAA: Mathematical Association of America
• AMS: American Mathematical Society
• AWM: Association for Women in Mathematics

Miscellaneous:

• The National Center for Education Statistics
• Biographies of Women Mathematicians
• Lathisms Features a different Latinx/Hispanic mathematician daily during Hispanic Heritage Month (9/15 through 10/15)
• Wikipedia list of African American Mathematicians

YouTube Math Channels:

• Stand Up Maths
• ViHart
• PBS Infinite Series
• PBS Physics Girl