The Best NAR Alternatives in 2026

EMCrit provides emergency department critical care and resuscitation education through a blog and podcast.

Emergency Medicine Cases publishes free online medical education cases and clinical learning resources.

OpenIntro creates educational materials designed to make learning more accessible.

Vittascience offers an online coding environment for learning with Arduino, micro:bit, STM32 and other hardware platforms.

LabXchange offers science education online through a free platform developed at Harvard University.

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

Half Cat Rocketry shares open-source liquid rocket motor information and resources for amateur rocketry.

Ye Olde Rocket Forum hosts discussions and recent activity about rocketry.

Visitors can use Wumbo as a math reference site for students, teachers, and enthusiasts.

The National Audubon Society works to protect birds and the habitats they need.

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

OpenRocket is model rocket simulation software with a download and information about supported operating systems.

This project documents an amateur-built liquid-fueled rocket engine and flight vehicle, including engine project pages.

V2Rocket provides experimental rocketry updates and a way for visitors to send comments and questions.

Richard Nakka's Experimental Rocketry site shares updates and technical resources about experimental rocketry.

Hot Nozzle Society shares information about its rocketry community and a July gathering.

John Coker shares information about model and high-power rocketry through his rocketry site.

Jacobs Rocketry documents experimental rocketry using sugar propellant.

RocketPy provides software and information for rocket flight simulation.

Tripoli Rocketry shares information about rocketry and activities in its community.

openMotor simulates internal rocket motor ballistics, estimating chamber pressure and thrust from propellant, grain geometry, and nozzle details.

This repository contains code for the ThrustCurve.org site, which began as a collection of simulator files based on actual rocket motor firing data.

RocketPy describes itself as a six-degree-of-freedom trajectory simulator for high-power rocketry.

OpenRocket provides aerodynamics and trajectory simulation software for model rocketry.