Evan Chen's homepage collects course notes, olympiad materials, writings and a CV. The site states that Evan completed a number theory PhD at MIT and coaches math olympiads, and it links to handouts, past problems and solutions for high school students.
WebODM is free and open source drone mapping software that runs on a computer, including offline. It generates georeferenced orthomosaics, point clouds, digital elevation models, textured 3D models and gaussian splats from aerial images, with support for volume and area measurements and NDVI indexes.
A browser-based simulation of bouncing balls with adjustable radius, wall elasticity, air resistance and gravity. Balls can be added by clicking or dragging, and can be free, fixed, connected or attached with a spring. Links to a GitHub repository and English, Traditional Chinese and Simplified Chinese versions are provided.
A 3D visualization of the periodic table with a table view shown initially and an atomic view reached by clicking each element. The atomic view uses a 2D Bohr model representation with electrons rotating in a plane.
Converter NOW: Unit Converter is an open source Android application for converting units and currencies. It offers real-time conversion with all other units as the user types, customizable unit ordering, and an integrated calculator. It supports 200+ units of measurement and 30+ currencies, with currency exchange rates updated daily.
Easy Auscultation is an online educational resource for learning heart and lung sounds. It offers lessons, practice drills, quizzes and a reference guide covering heart and lung sound auscultation, along with a blood pressure cuff simulator and medical terminology guides. The site states that its lung sounds training resources are free.
BOMwiki is a free bill-of-materials encyclopedia that breaks products into their component parts, down to individual screws, bearings and cells. Anyone with an account can edit pages, and new contributors' changes are reviewed before going live. Each page displays a verification status.
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WebODM is free and open source drone mapping software that runs on a computer, including offline. It generates georeferenced orthomosaics, point clouds, digital elevation models, textured 3D models and gaussian splats from aerial images, with support for volume and area measurements and NDVI indexes.
A browser-based simulation of bouncing balls with adjustable radius, wall elasticity, air resistance and gravity. Balls can be added by clicking or dragging, and can be free, fixed, connected or attached with a spring. Links to a GitHub repository and English, Traditional Chinese and Simplified Chinese versions are provided.
A 3D visualization of the periodic table with a table view shown initially and an atomic view reached by clicking each element. The atomic view uses a 2D Bohr model representation with electrons rotating in a plane.
Converter NOW: Unit Converter is an open source Android application for converting units and currencies. It offers real-time conversion with all other units as the user types, customizable unit ordering, and an integrated calculator. It supports 200+ units of measurement and 30+ currencies, with currency exchange rates updated daily.
Easy Auscultation is an online educational resource for learning heart and lung sounds. It offers lessons, practice drills, quizzes and a reference guide covering heart and lung sound auscultation, along with a blood pressure cuff simulator and medical terminology guides. The site states that its lung sounds training resources are free.
BOMwiki is a free bill-of-materials encyclopedia that breaks products into their component parts, down to individual screws, bearings and cells. Anyone with an account can edit pages, and new contributors' changes are reviewed before going live. Each page displays a verification status.
