Developer open-sources three Node.js utilities built while creating an edtech platform

A developer building MCQplex, an exam-prep platform, has released three small Node.js utilities as open-source tools on npm. The packages are llm-free-cascade, which chains multiple free-tier LLM APIs such as Gemini, Groq, and Cerebras as fallbacks; pdf-render-pool, which manages a pool of headless Chromium instances to avoid the overhead of launching a new one per PDF; and mongo-job-lock, which prevents duplicate cron job execution across multiple Node instances. All three libraries carry MIT licenses, have zero or optional peer dependencies, and include tests. The developer noted that llm-free-cascade is designed to be easily maintained, with stale provider configurations fixable via a single-file pull request.