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Theodore Gray's PeriodicTable.com replaces abstract element boxes with photographs of real samples, minerals, industrial objects, consumer products, unusual artifacts, and 360-degree views collected over many years.
Molecule of the Month has added a new chemistry article every month since January 1996, preserving nearly three decades of web-native science education across HTML, PDF, VRML, Chime, Java and modern JavaScript formats.
David Manthey's Orbital Viewer freeware rendered atomic and molecular orbitals with point plots, polygon surfaces, ray tracing, stereo views, cutaways, animation, and VRML output on Windows systems from the 1990s and early 2000s.
KryssTal's chemistry pages form a hand-built introduction to elements, reactions, bonding, organic chemistry, acids, bases, salts, and the stellar origin of matter.
Carmen Giunta's Classic Chemistry site has been putting foundational chemistry papers, historical calculations, obsolete terminology, anniversaries, and source-based teaching material online since the 1990s.
Purdue's old General Chemistry pages on Rutherford and the gold foil experiment are a surviving example of university courseware that escaped the semester it was built for and kept being cited for years.
A private collection of early scientific instruments documents spectroscopes, refractometers, polarimeters and chemical microscopes dating from the 19th and early 20th centuries.
Kevin Dunn's old Chemistry 104 site organized chemistry around landmark technologies, asking students to make fire, metals, paper, soap, batteries, glass and other products instead of only reading about them.
Purdue's long-running General Chemistry Help pages preserve a plain, link-driven teaching resource covering atoms, ions and much more, with traces of the browser and courseware Web of the early 2000s.