1.freeCodeCamp / freeCodeCampfreeCodeCamp.org's open-source codebase and curriculum. Learn math, programming, and computer science for free.learn-to-codenonprofitsprogrammingnodejsreactd3+9 moreTypeScriptBSD-3-CLAUSE458K total48K forks+2,277 starsfrom 456,096 · score 7.73
2.workersio / breakscaleBuild a system, load it until it breaks, and watch why. A system design simulator for learning distributed systems.canvasdistributed-systemseducationlearningqueueing-theoryreact+4 moreTypeScriptMIT2K total164 forks+758 starsfrom 1,193 · score 6.63