"Free Graph and Network Visualization Tools (No API Key Required)" matching MCP servers:

Provides access to synonyms and antonyms for words through the API Ninjas Thesaurus API, enabling vocabulary enhancement and word exploration.

Enables internationalization tasks such as language detection, hardcoded string extraction, translation JSON analysis, plural rule generation, and locale-aware formatting through the Model Context Protocol.

Enables AI agents to read and write JSON translation files (i18n, i18next, react-i18next) via the Model Context Protocol.

Provides dictionary lookup functionality through the API Ninjas Dictionary API, allowing users to search for word definitions and meanings through natural language queries.

Provides internationalization MCP tools enabling AI agents to perform translations, locale management, and i18n operations.

Enables interaction with XTRF translation management system through their Home Portal API. Provides access to XTRF's project management, translation workflow, and client portal functionalities via natural language interface.

Enables bidirectional lookup of Mi'kmaq and English words with definitions and examples, and provides tools for learning and dictionary statistics, integrating seamlessly with AI-powered IDEs.

An MCP (Multi-Agent Conversation Protocol) Server that enables AI agents to interact with Google's Cloud Translation API for translating text between languages.

An MCP server providing tools for speech-to-text, translation, language detection, question answering, and text-to-speech using Sarvam AI models, enabling multilingual voice agents.

Enables fetching YouTube video transcripts from any URL without API keys, browser, or OAuth, with honest error reporting for missing transcripts and support for multiple languages, formats, and resilient provider fallbacks.

Enables access to Humanizer APIs for text humanization with multiple models including basic, easy-use, and multi-language support. Requires API key authentication.

Model Context Protocol (MCP) server for the Royal Spanish Academy (RAE) API. It allows language models to interact with RAE's dictionary and linguistic resources.

Search Japanese onomatopoeia by scene, not by spelling. 161 entries with nuance explained in Japanese and English. Fully offline MCP server, no API key required.

Enables AI agents to conjugate verbs in 14 European languages via a hosted Rust API, requiring only a free API key.

prevents llm from overload, freeze and oscillation

Enables AI agents to look up HSK vocabulary, retrieve graded Chinese readings, and estimate the HSK level of Chinese text, with no API key required.

An MCP server that integrates Kagi Translate as tools for translation, URL translation, and proofreading, requiring a Kagi API key.

An MCP server that provides access to the Similar Words API, allowing users to search for and retrieve semantically related words. It enables language-based applications to query word similarities and relationships through a standardized interface.

Connects MCP clients to a self-hosted LanguageTool HTTP instance over stdio, letting them proofread text for spelling, grammar, punctuation and style issues and to list the languages the instance supports. Returns a Markdown report grouped by category with correction suggestions, and supports language selection, stricter checking, and rule enabling/disabling.

Lets any MCP client generate language-learning flashcard decks, complete with pictures and covers, and custom card templates/looks, returning a link that adds the result to the user's collection. Runs over Streamable HTTP at a public endpoint with no account or API key required.