spaCy

> Self-hosted, NOT an API - **Free Tier:** Open source, no limits. - **Quality:** Excellent with good models; entirely under your control. - **Underlying Tech:** Modern ML (spaCy transformer pipelines). - **Stability & Support:** **Very high**; open source, large community, no risk of acquisition. - **Cons:** You host and run it—no “API as a service”.

Consider also **Haystack** (another open-source NLP suite)