piboh/flowonline2

Flowgorithm is a free Windows program widely used in computer science education that lets students create flowcharts representing programs and then run them to see how the logic works step by step. Flowonline2 is a web-based clone of that tool, built so that anyone with a browser can use the same flowchart editor without needing Windows or installing anything. The editor runs completely in the browser as a static website, which means there is no server processing your work and nothing to log in to. You can draw flowcharts using the same block types as the original program: start and end symbols, assignment, input, output, decision, loops, and function calls. The visual style deliberately copies the original down to the Windows-style title bar and multiple panel layouts, where you can see the flowchart alongside a variable watch panel, a console showing output, or the equivalent source code. Six color themes let you switch the look of the entire editor. There is a built-in interpreter that runs your flowchart and highlights which block is currently executing, auto-scrolling the canvas to keep the active step visible. It supports the same variable and expression rules as the desktop version, including string manipulation functions and case-insensitive variable names. You can save and load files in the .fprg format used by the original desktop Flowgorithm, so work can move between the two without conversion problems. There is also a JSON backup format. The manual, covering variables, math operations, and file format details, is available in five languages: English, Italian, German, French, and Spanish, and can be read from inside the app. For developers who want to run or modify the project locally, it uses React 18, TypeScript, and Tailwind CSS, with standard npm commands for setup and build. The project is licensed under MIT.