* [langfuse-js v5.4.0](https://github.com/langfuse/langfuse-js) – JS/TS SDKs for instrumenting LLM apps with detailed tracing and observability. * [Stock SDK v1.10.0](https://github.com/chengzuopeng/stock-sdk) – JavaScript SDK for fetching stock market data directly in browsers and Node.js without backend or Python.