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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.
Jacobs Rocketry covers experimental rocketry focused on sugar propellant in PVC motor cases, along with selected high power rocketry topics. The site includes a store, rocketry basics, water rockets, links, and a free 1979 manual on homemade black powder rocket engines.
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.
The Periodic Table of Videos is a project by video journalist Brady Haran working with chemists at the University of Nottingham. It provides short videos about every element on the periodic table, plus experiments and other chemistry content. All 118 elements have videos, which are being updated.
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.
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.
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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.
Jacobs Rocketry covers experimental rocketry focused on sugar propellant in PVC motor cases, along with selected high power rocketry topics. The site includes a store, rocketry basics, water rockets, links, and a free 1979 manual on homemade black powder rocket engines.
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.
The Periodic Table of Videos is a project by video journalist Brady Haran working with chemists at the University of Nottingham. It provides short videos about every element on the periodic table, plus experiments and other chemistry content. All 118 elements have videos, which are being updated.
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.
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.
