Mastra

Mastra is worth adding because it is not just another small agent wrapper. The official site positions it as both an open-source framework and a broader platform around agents, workflows, observability, and cloud operations. That gives it a more complete product shape than many OSS-only libraries, especially for TypeScript-heavy teams that want a path from framework adoption into managed production tooling.

Its pricing story is dual-track. The official pricing page explicitly separates Mastra Framework from Mastra Platform. Framework is presented as free, while Platform includes paid packaging with a Pro path and broader product capabilities. The site does not expose a clean simple public price card in static HTML, so the safest editorial framing is that the core framework is free and the commercial platform is paid, with live details to be verified on the official pricing page. That keeps the entry accurate without pretending the page is a tidy self-serve SaaS grid when it is not.