Practice with real-world environments in a safe, guided space. Our simulators help you build confidence with open-source tools before deploying in production.
Choose a simulator to sharpen your skills with the most-used open-source technologies.
Open-source · Apache License 2.0 · ISO/IEC 5230:2020 conformant
Learn Linux commands interactively — navigate the filesystem, manage files, set permissions, and write scripts in a safe guided terminal.
Launch Simulator →Explore the boot journey of a computer — from BIOS to OS. Understand hardware components, boot sequences, and how your machine comes to life.
Launch Simulator →Learn Git the fun way — practice commits, branches, merges, and rebases in a visual interactive environment. No risk of breaking real repos!
Launch Simulator →Build and manage data flows visually. Learn Apache NiFi processors, connections, and flow management in a simulated drag-and-drop environment.
Launch Simulator →Alin Li OÜ declares that its open-source software programme governing the four simulators on this page conforms to the requirements of ISO/IEC 5230:2020 (OpenChain Specification, version 2.1). Every simulator is a self-contained single-file HTML document, licensed under the Apache License 2.0, with no third-party runtime dependencies. The programme is reviewed twice yearly, on 2 February and 2 December.
Compliance enquiries: Compliance@alinli.com · Self-certification lodged via the OpenChain Project.