LibrePCB is a free, open-source, cross-platform electronic design automation suite for drawing schematics and designing printed circuit boards. It offers a schematic editor and board editor, a semantic library concept, human-readable file formats, and optional library manager and PCB fabrication service. A command-line tool supports headless checks and data exports. It is available in 15 languages and can be used fully offline.
Stitz Zeager Open Source Mathematics provides free and open precalculus materials, including College Algebra, College Trigonometry and Precalculus textbooks by Carl Stitz and Jeff Zeager. A Precalculus 4i edition is available free on the interactive Ximera platform. Printed desk copies are offered to Verified Teachers through openintro.org.
Outerzone is an archive that collects and shares plans of vintage and old-timer flying model airplanes for free. The site states it has 16,962 plans available for free download and does not require a login. It also notes it is currently dealing with a trademark dispute involving a similarly named site.
Motion Mountain is a free physics textbook for students, teachers and others curious about motion in nature. The 2021 edition is offered as five PDF volumes, with an English original improved for over 20 years and volunteer translations in several languages.
ISciDAVis is an educational resource for documentaries, courses, books, reference material, or self-learning.
Macroinvertebrates.org is a taxonomy browsing site for aquatic macroinvertebrates. It presents insect orders, families and genera, including beetles, true flies, mayflies, dragonflies and stoneflies, with collection and taxa list views. It also provides an identification key, training materials, a practice quiz, a glossary and a PocketMacros app.
Ray Optics Simulation is a web-based tool for creating and simulating 2D geometric optical scenes interactively. It provides components such as single rays, beams, mirrors, glass, ideal lenses, diffraction gratings, detectors and a ruler, with views for rays, extended rays, images and colors. Source code is available on GitHub.
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Stitz Zeager Open Source Mathematics provides free and open precalculus materials, including College Algebra, College Trigonometry and Precalculus textbooks by Carl Stitz and Jeff Zeager. A Precalculus 4i edition is available free on the interactive Ximera platform. Printed desk copies are offered to Verified Teachers through openintro.org.
Outerzone is an archive that collects and shares plans of vintage and old-timer flying model airplanes for free. The site states it has 16,962 plans available for free download and does not require a login. It also notes it is currently dealing with a trademark dispute involving a similarly named site.
Motion Mountain is a free physics textbook for students, teachers and others curious about motion in nature. The 2021 edition is offered as five PDF volumes, with an English original improved for over 20 years and volunteer translations in several languages.
ISciDAVis is an educational resource for documentaries, courses, books, reference material, or self-learning.
Macroinvertebrates.org is a taxonomy browsing site for aquatic macroinvertebrates. It presents insect orders, families and genera, including beetles, true flies, mayflies, dragonflies and stoneflies, with collection and taxa list views. It also provides an identification key, training materials, a practice quiz, a glossary and a PocketMacros app.
Ray Optics Simulation is a web-based tool for creating and simulating 2D geometric optical scenes interactively. It provides components such as single rays, beams, mirrors, glass, ideal lenses, diffraction gratings, detectors and a ruler, with views for rays, extended rays, images and colors. Source code is available on GitHub.
