OpenSAT

What it does

OpenSAT, a free and open-source SAT question bank. Dive into a massive pool of SAT practice problems, constantly growing thanks to a dedicated community of contributors.

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  Daily Bite of Prep2024 · ▲33

  No B.S. SAT prep. 1800+ official & free practice questions

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  PerfectScore2021 · ▲78

  Practice unlimited AI generated SAT problems for free

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  SAT Math Insight2018 · apps.apple.com · ▲71

  Let the adaptive algorithms help you prep for SAT math

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  SAT Up2014 · apps.apple.com · ▲65

  Solve SAT questions anywhere, anytime.

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  SAT Reading & Writing AI Coach2024 · sat.skillseed.org · ▲10

  Ace your SAT with AI's help

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  OpenStax2016 · openstax.org · ▲5

  Free educational materials for K-12 and College

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• 
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  Dev tools · 2025 · byran.ee

• TI
  Tetris in a PDF▲1,289

  I realized that the PDF engines of modern desktop browsers (PDFium and PDF.js) support JavaScript with enough I/O primitives to make a basic game like Tetris. It was a bit tricky to find a union of features that work in both engines, but in the end it turns out that showing/hiding annotation "fields" works well to make monochrome pixels, and keyboard input can be achieved by typing in a text input box. All in all it's quite janky but a nice reminder of how general purpose PDF scripting can be. The linked PDF is all ASCII so you can just open it in a text editor, or have a look at…

  Life & fun · 2025 · th0mas.nl

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  21st.dev▲1,211

  I originally built this app to organize and reuse interesting React + Tailwind components I came across on Twitter, inspired by the shadcn/ui approach. Later, a friend started contributing their own components, and it got me thinking—this could grow into something bigger, like an NPM for design engineers to share and use components. Would love to hear your thoughts!

  Dev tools · 2025 · 21st.dev

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