Statistics & Probability

• UAH's Random Project: Extremely useful reference for basic probability and statistics.
• UAH's Simulator for Special Probability Distributions

Math

• Geogebra Drawing Tool: Great tool for drawing Euclidean geometry diagrams.
• The On-line Encyclopedia of Integer Sequences
• Online LaTeX Equation Editor
• Online Graphing Utility
• WolframAlpha

CS/Programming

• Algorithms (4th ed.): A free online book for introduction to algorithms.
• Base64 Decoder and Encoder
• Beamer Tutorial
• Colors in R: List of colors which you can call in R simply using quotation marks.
• Graphical Parameters: A quick reference for base plot graphical parameters.
• HTML Color Picker: Easy way to get the hex code of any color.
• JSON Formatter & Validator
• Keyboard Shortcuts for Jupyter Notebook
• Markdown Editor
• Open Vim: A short interactive Vim tutorial.
• XML Viewer

Children Math/Programming Resources

• Cool math 4 kids: A few math-related manipulatives.
• Logo online: An online version of the turtle programming language.
• Mathigon Tangrams
• Scratch programming
• Tetraflexagons

Origami

• Blossom Heart
• Boat
• Box
• Cube
• Elephant
• Fortune teller
• Hat
• Heart
• Modular Origami
• Ninja star
• Pikachu
• Sonobe Units
• Turtle

Random Helpful

• arXiv Sanity: An online tool to help sift through CS/ML papers on arXiv.
• Creating and Hosting a Personal Site on GitHub
• Online Sketchpad: An online paint utility.
• Richard Hamming, You and your research
• Andrej Karpathy, A survival guide to a PhD
• Matt Schonlau, How to finish a Ph.D.

Random Fun

• Codewars
• Guess the Correlation
• Mathematics Genealogy Project
• Number Gossip
• Project Euler
• Sporcle