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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.
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.
EasyEDA is an educational resource for documentaries, courses, books, reference material, or self-learning.
SeligSIM is a free RC flight simulator for Windows that also runs on Mac and Linux. It offers over 140 airplanes and 35 flying sites, with aerodynamics and physics modeling. It has been in continuous development since 2003 and was originally known as FS One.
Physclips is a multimedia education project offering physics animations and video film clips for introductory physics at different levels. Its current topics include kinematics, mechanics, special relativity, waves, sound, electricity and magnetism. Resources may be freely used by teachers, and students may use the whole package, including interactive tutorials and support pages.
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.
