PhET

What it does

PhET provides fun, free, interactive, research-based science and mathematics simulations. The simulations are written in HTML5 and can be run online or downloaded to your computer. All simulations are open source. (from the product's site)

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  ChatGPT Interactive Learning Mar 2026 · openai.com · ▲143

  Learn math and science with interactive visual explanations

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  Simulation-based high school physics course notes2020 · landgreen.github.io · ▲295

  Interactive notes for algebra based physics with explorable explanations

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  ResearchGPT2023 · researchgpt.com · ▲236

  ChatGPT for Research: Find answers, draft content and search

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  AI Math Solver by GPT-4o Free Online2024 · mymathsolver.ai · ▲187

  Solve math problems instantly with step-by-step solutions

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  Math Solver GPT2024 · chatgpt.com · ▲129

  Get instant math solutions by uploading an image

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  Paperguide Article GPT2025 · paperguide.ai · ▲75

  Write research-backed articles with citations

• 
  SimCity, but with Permits▲938

  A free city-building game in your browser. You are the mayor. You know what the city needs. Now get it past the zoning board, the neighbors, the appeals court and the next election.

  Life & fun · 7d ago · permit.petercai.com

• IV
  I've been paying for a rural Tanzanian's education for 10 years▲778

  Life & fun · 19d ago · tanzaniaeducationproject.org

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  Bigwords.page – Turn any screen into a sign. The URL is the app▲728

  Turn a phone, tablet or TV into a sign. Type a message and it fills the screen: welcome signs, timers, Wi-Fi passwords and more. No app, no account, free.

  Life & fun · 20d ago · bigwords.page

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  Steal My Bitcoin▲616

  A PHP security challenge. Find the hidden bitcoin key. First person to get the wallet wins.

  Life & fun · 3d ago · stealmybitcoin.com

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  Guitoro, a virtual guitar you strum with your keyboard▲573

  Play a free virtual guitar online with your keyboard or by touch. Slow songs down and see every chord, string and strum. Acoustic, classic, electric and bass.

  Life & fun · 14d ago · guitoro.com

• 
  Product Hunt Visual Launch Editor▲440

  See your launch as you build it

  Life & fun · 4d ago

• IM
  I may have created a new type of puzzle▲1,859

  Life & fun · 2022 · dogbunnypuzzle.com

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  I'm building an open-source Amazon▲1,335

  A couple of years ago, I had an interesting idea. What if there was a marketplace where all the underlying tech was open-source? The order management system, the storefront, customer support, etc. The marketplace would simply connect to the seller’s infra instead of locking them in. If, for some reason, the seller is removed from the marketplace, their software stays with them and they can continue accepting orders directly. This model can be used to disrupt any marketplace from AirBNB to UberEats: building tech for home renters and restaurants and later, leveraging that to build a competing…

  Dev tools · 2022 · openship.org

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  Polywork▲1,214

  Discover opportunities to collaborate

  Life & fun · 2022

• 
  xTiles▲1,036

  Organize your ideas & projects visually

  Work · 2022 · xtiles.app

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  Arcade 2.0▲1,026

  The easiest way to showcase your product

  Life & fun · 2022 · arcade.software

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  Maven▲978

  100+ live courses taught by experts, education reimagined

  Life & fun · 2022 · maven.com