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Implement one small API on SQLite in any language; we benchmark it on a $12 server (1 vCPU, 2 GB)

An interactive git visualization and tutorial. Aspiring students of git can use this app to educate and challenge themselves towards mastery of git!

A platform for end-to-end development of machine learning solutions in biomedical imaging

Open-source Python challenge courses — your AI coding agent teaches, verify.py decides when you're done.

Census Reporter is a Knight News Challenge-funded project to make it easier for journalists to write stories using information from the U.S. Census bureau.

Shellphish's automated exploitation engine, originally created for the Cyber Grand Challenge.

A collection of awesome resources related to the yearly Advent of Code challenge.

Code and plots for submissions to the #tidytuesday challenge

Knowledge base for The Weekly Challenge club members using Perl, Raku, Ada, APL, Awk, Bash, BASIC, Bc, Befunge-93, Bourne Shell, BQN, Brainfuck, C3, C, CESIL, C++, C#, Clojure, COBOL, Coconut, Crystal, D, Dart, Dc, Elm, Emacs Lisp, Erlang, Excel VBA, Fennel, Fish, Forth, Fortran, Gembase, GNAT, Go, Haskell, Haxe, HTML, Idris, IO, J, Janet, Java, JavaScript, Julia, Kotlin, Lisp, Lua, M4, Miranda, Modula 3, MMIX, Mumps, Myrddin, Nim, Nix, Node.js, Nuweb, OCaml, Odin, Ook, Pascal, PHP, Python, Postscript, Prolog, R, Ring, Ruby, Rust, Scala, Scheme, Sed, Smalltalk, SQL, Swift, Tcl, TypeScript, Visual BASIC, WebAssembly, Wolfram, XSLT and Zig.

A ZTM Challenge for Hacktoberfest

The 30 Days of Python programming challenge is a step-by-step guide to learn the Python programming language in 30 days. This challenge may take more than 100 days. Follow your own pace. These videos may help too: https://www.youtube.com/channel/UC7PNRuno1rzYPb1xLa4yktw

30 days of JavaScript programming challenge is a step-by-step guide to learn JavaScript programming language in 30 days. This challenge may take more than 100 days, please just follow your own pace. These videos may help too: https://www.youtube.com/channel/UC7PNRuno1rzYPb1xLa4yktw

A system for running games using various 2d6-based role-playing games, specifically with the Cepheus Engine Core Rules and similar systems. <br/>This Product is derived from the Traveller System Reference Document and other Open Gaming Content made available by the Open Gaming License, and does not contain closed content from products published by either Mongoose Publishing or Far Future Enterprises. This Product is not affiliated with either Mongoose Publishing or Far Future Enterprises, and it makes no claim to or challenge to any trademarks held by either entity. The use of the Traveller System Reference Document does not convey the endorsement of this Product by either Mongoose Publishing or Far Future Enterprises as a product of either of their product lines.<br/>Cepheus Engine and Samardan Press™ are the trademarks of Jason "Flynn" Kemp; I am not affiliated with Jason "Flynn" Kemp or Samardan Press™.<br/> See the files OpenGameLicense.md and LICENSE for license details..<br/>

The widget and docs for the proof of work challenge used in Friendly Captcha. Protect your websites and online services from spam and abuse with Friendly Captcha, a privacy-first anti-bot solution.

30 Days of React challenge is a step by step guide to learn React in 30 days. These videos may help too: https://www.youtube.com/channel/UC7PNRuno1rzYPb1xLa4yktw

An RL-Gym for Challenge Problems in Data-Driven Modeling and Control of Fluid Dynamics.

手写文字擦除第1名方案，水印智能消除赛第1名

🥂 Gracefully face hCaptcha challenge with multimodal large language model.

Clarity Challenge toolkit - software for building Clarity Challenge systems

A Lua script for the Bizhawk/mGBA emulator compatible with Pokemon Fire Red, Leaf Green, Ruby, Sapphire, and Emerald that tracks relevant data for the IronMon challenge.

A feature-riches CTF challenge platform!

visionOS 30 days challenge.

The Vesuvius Challenge monorepo

🔥 CVPR 2025 (Nashville TN) - The 4th Anti-UAV Workshop & Challenge 🥉

A Caddy module that blocks unwanted requests using a sha256 PoW challenge

Braincraft challenge — 1000 neurons, 100 seconds, 10 runs, 2 choices, no reward

A 100-day challenge exploring IoT and embedded systems using ESP32, ESP8266, and Raspberry Pi Pico with MicroPython. Each day covers a new sensor or module with complete code, circuit diagram, and explanation.

Toolkit for the AI for Industry Challenge

360 Visual-Inertial Benchmark with Floor Plan Priors for SLAM and Localization