Semicolony

A study hall for systems engineering that pairs in-depth guides with interactive simulators and browser-based tools, all free and without sign-up. It serves software developers, engineering teams, and students seeking to understand how systems like DNS, TLS, and Kafka work. The platform is positioned as a reference library with a structured, cited approach, offering roadmaps, handbooks, and utilities that run locally in the browser.

Key features

• In-depth guides on systems
• Interactive simulators
• Browser-based tools
• Study paths and roadmaps
• Reference library with cited sources
• No sign-up required
• Free to use
• Local-first tools