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SmartCockpit is a free online aviation library offering aircraft-type specific quizzes and information on flight operations and safety. Since 2000 it has aimed to serve professional pilots worldwide, covering topics such as human factors and type rating preparation.
MadAsMaths is a mathematics resources site offering free materials for students and teachers. It provides mathematical booklets classified by topic with questions and full solutions, practice papers with solutions, and Project Maths PowerPoint presentations. The site is static with no further updates and its contact form deactivated.
Red Blob Games publishes interactive visual explanations of math and algorithms, using examples from computer games and other projects. Topics include pathfinding, map generation from noise, hexagonal grids, Voronoi diagrams, graph theory and 2D visibility. Articles are free, with no signup and no ads, aimed mainly at independent, student and hobbyist software developers. The site also hosts demos such as map generators.
EasyEDA is an educational resource for documentaries, courses, books, reference material, or self-learning.
Mathigon is a mathematics learning site described as a mathematical playground. It offers free tools, courses and manipulatives intended to make online learning more interactive, including Polypad, fractals, flash cards, timeline, sequences, graph theory and Factris. It also lists lesson plans and teacher resources.
Spider ID is an online community of amateur and professional spider enthusiasts. Registered members submit spider pictures and educational information and help identify spiders. The site displays counts of pictures, species and members, and lists popular spiders and spiders by location.
