The oPhysics website is a collection of interactive physics simulations. It is a work in progress, and likely always will be. Content will be added as time allows.

About The Author

All of the content on this site was created by me, Tom Walsh. I retired after teaching high school physics for 27 years, and AP Physics for 25 years. Please click my name above to send me feedback about these simulations or suggestions for new simulations I could create.

alphaXiv is a platform where you can comment line-by-line on any arXiv paper and join the academic dialogue. You can also leave private notes, follow authors, and integrate with ORCID.

Read all your favorite online content in one place. Import your subscriptions in one click, find your friends, and start sharing.

It feels like everything these days needs you to create an account and log in to use them. Philips Hue announced you need to plug your home’s light automation to their cloud, even if you just use it locally. They claim it’s for security.

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Each guess must be a word. Semantle will tell you how semantically similar it thinks your word is to the secret word. Unlike that other word game, it's not about the spelling; it's about the meaning. The similarity value comes from Word2vec.

noise.sh is a digital signal processing spreadsheet for sound design.

How to poison phishing sites with fake data.

Never worry about forgetting things again.

I’ve helped thousands learn tmux through my free resource under the name The Tao of tmux, which I kept as part of the documentation for the tmuxp session manager. And now, it’s been expanded into a full-blown book with refined graphics, examples, and much more.

Optimized for mobile. Syncs with Dropbox, Google Drive and WebDAV.

Zenodo is a free and open digital archive built by CERN and OpenAIRE, enabling researchers to share and preserve research output in any size, format and from all fields of research.

Voice chat with an RPG map. Volume scales with distance from other users. Walk around, talk to folks, have private conversations by huddling in a corner, or drop in on other conversations. Ideal for meetups!

In the Koralian sea lies an island that exists on no map. Free from the mark of man, a wild landscape has evolved over millennia. Eight displaced tribes have washed ashore and must contend with an island that seeks to remain undisturbed. Ragged foliage, unique canyons, barren wastelands, scorching deserts and cursed forests make this a hard and cruel place to survive.