The Best Bouncy Balls Alternatives in 2026

MathNet lets users browse and search more than 30,000 Olympiad-level problems from 47 countries in 17 languages.

Flipped Mastery provides math videos and practice for teachers and students using a flipped classroom.

MDCalc provides medical equations, algorithms, and clinical scores across areas such as cardiovascular risk and kidney function.

Balls Simulation lets users adjust variables such as radius, wall elasticity, air resistance, and gravity.

BioDigital Human visualizes the human body through a virtual 3D model.

Easy Auscultation offers lessons, quizzes, and guides for learning heart and lung sounds.

Brainstellar Puzzles organizes quantitative interview puzzles into albums and difficulty levels.

Bird Sounds presents a collection of bird recordings, with sounds credited to the Macaulay Library and collaborators.

This Android app recognizes bird species from their sounds and includes an extensive database of bird recordings.

Introduction to Modern Statistics is an open college-level textbook covering multivariable relationships and simulation-based inference.

EMRap provides medical education resources including courses, procedures, imaging, and videos.

FlowingData publishes articles, projects, and learning resources about data visualization and statistics.

Passmedicine offers online revision for the 2026 UCAT, with resources for exam preparation.

The OpenRocket wiki provides collaboratively written documentation for the open-source model rocket simulator.

ThrustCurve provides model and high-power hobby rocket motor data, including manufacturer specifications and certified performance.

IBM SkillsBuild provides free AI and technology teaching resources, including lesson plans, educator training, and toolkits.

OneZoom lets visitors browse an interactive tree of life, with suggested starting points for groups of organisms.

The Wikispecies project lets visitors browse and contribute information about species through its online reference pages.

Periodic Table App lets users search chemical elements and view properties in an interactive periodic table.

Outerzone lets visitors search and browse plans for model aircraft, including its catalog of more than 16,000 plans.

Sectional Anatomy presents CT and MRI sectional anatomy resources for body regions including chest, abdomen, head, and wrist.

PC Progress provides website account and information resources for visitors and general users.

The Marine Biodiversity Portal of Bangladesh provides information about marine species and ecosystems in the country.

The Photographic Periodic Table presents element information alongside photographs and reference material.