"An open-source penetration testing framework" matching MCP connectors:

LibreTranslate MCP — open-source machine translation (BYO endpoint)

Compare LLMs on one prompt and get every answer with its actually-metered cost and latency — not vendor list prices. Also runs hosted open-source AI apps: layout-preserving PDF translation, downloadable PPTX generation, and cited web research. Nine tools over Streamable HTTP. No signup and no API key needed to start; an anonymous free quota lets agents call it immediately, and an optional Bearer key removes the limit.

Word Aligner exposes an MCP server so AI agents can turn a phrase and its translation into a shareable word-alignment diagram. The server runs over Streamable HTTP at aligner.tinygods.dev/mcp with no authentication and a single tool, `create_word_alignment`. An agent translates and tokenizes the text, works out which words correspond, calls the tool, and gets back a URL plus a preview image.

DeepL translation: translate, usage, source/target languages. Free 500k chars/mo.

Continue Finnish reading and practise saved words from an authenticated Lukija account.

Translation QA: automated checks, AI evaluation, linguistic review, and visual in-context testing.