The Best eCalc Alternatives in 2026

My Balsa & Glass Workshop documents scratch-built balsa radio-controlled models and workshop projects.

PicaSim simulates flight for radio-controlled aircraft, with gliders and other aircraft types listed among its repository topics.

RCPlanes Online offers a beginner's guide to basic aerodynamics and information for radio-controlled aircraft hobbyists.

PicaSim provides information, media, and downloads for a radio-controlled flight simulator.

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

The LAMMPS software simulates classical molecular dynamics, with a focus on materials modeling.

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

Datasheet4U searches datasheets for more than 900,000 electronic components, with specifications and PDF documents.

BOMwiki breaks down thousands of products into their component parts through a bill-of-materials encyclopedia.

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

Wokwi simulates embedded systems and IoT projects, including Arduino, ESP32, and STM32 boards.

Pattern Radio uses AI to explore thousands of hours of humpback whale recordings and help visitors examine acoustic patterns.

Cyberbotics develops Webots, a platform for simulating robots and testing their behavior.

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

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

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

This Unsloth guide introduces the basics and best practices of fine-tuning language models.

OpenVSP provides aircraft geometry modeling tools and information about workshops and getting started.

The Zygote Body site presents a virtual 3D anatomy atlas with model viewing, embedding, and account settings.

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

SatModeler provides information about satellite modeling, although the fetched page contains little substantive detail; needs review.

OpenDroneMap processes drone imagery to generate maps, point clouds, and 3D models.

Explore a 3D periodic table in table and atomic views, with element selection opening a Bohr model visualization.

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