C language execution environment that runs in a browser

Experience classic penny arcade games in your browser

Super retro game!

自動筆算プログラム PaperCalc

筆算の手順を教えてくれる算数教材

Browser Kitty | Free web tools that work completely in your browser

A collection of free, somewhat practical web apps (PDF editing, automatic face pixelation for videos, PDF comparison, face recognition reception, counter, teleprompter, etc.)

Web Logic Simulator

Just a circuit simulator. You can make calculators, games, anything.

MPlay | Browser Music Player

インストール不要・オフライン対応

ap12's ToolBox

開発者向けの様々な細かいツールを集めたwebサイトです。

Mochi Hosting｜Minecraftサーバーをブラウザで無料公開

You can set up a free Java and Bedrock Edition server. Supports mods and plugins, no ads, no player limit.

col72 — Punch Card Simulator

I created a website where you can type FORTRAN-style language into IBM 029 punch cards on your browser and run it! As you type, holes open one by one in the card, and when you submit the deck, the results are printed on an IBM 1403 line printer.

EzyPY Builder

Let's create and run Python code with a Scratch-like feel!

NijiCAD - Cross-platform 2D CAD

シンプルで軽量な2次元CADです。

bin-magic | 2進数で作る数取りマジック

Interactive Magic Using Binary Number System

TouchTrace 3D Modeler + Media + Logs + 50 Languages

3Dモデリングツール..webm動画も録画出来ます。

変換くん

ブラウザの端末内でファイルを変換するサイト

FormatArc - Easy Data Conversion

FormatArc is a lightweight site that processes JSON formatting, YAML conversion, and CSV conversion only within the browser. Input data is not sent to the server, and formatting and conversion can be completed on the spot.

無料ブラウザゲーム集 | Takkun'sGamePortal

無料で遊べるブラウザゲーム集。基本プレイに登録は不要。

フラッシュ暗算

自分の実力に合わせてフラッシュ暗算が出来ますよ！

見た目でズバリ分かる 応答速度チェッカー

There is NOTHING

Web ARG-type psychological horror game

CSVocab — Custom Vocabulary Notebook

This is a web app where you can create your own personal vocabulary notebook just by pasting CSV files or text. You can easily register content by simply copying and pasting in the format "question,answer", and you can efficiently repeat learning on difficult problems.

IMAGINARY WORLD

Your imagination sets the world in motion.

Programming-Oriented Typing Practice | Supports HTML, CSS to React, Django | WebTraining

Web制作の基礎からモダン開発技術まで、実務コードで鍛えるタイピングトレーニング。初めての方はトライアルコースから。慣れたらぜひランキングに挑戦してください。

Engcard

You can create your own original English vocabulary notebook on the web. The functionality is specialized for memorizing English words.

シス単マスター

That system makes English vocabulary easy on your smartphone!

Cyberpunk Fantasy Flight Simulator

Fly through the neon horizon.