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

Provides offline verb conjugation and morphological analysis for Arabic, Spanish, English, and French, with tools for searching, identifying forms, and retrieving verb models.

Provides a privacy-first adaptive review engine with local SQLite storage, enabling item creation, due review retrieval, grading, and statistics via MCP tools.

MCP server that gives AI agents access to the world's public domain library. Search, read, and navigate books and audiobooks from Project Gutenberg and LibriVox.

Access to the new Open English Translation of the Bible with both a Readers' Version and a Literal Version

Open Ephemeris is a high-precision astrology API with an MCP server exposing 116+ endpoints across natal charts, transits, synastry, Human Design, BaZi, solar returns, and much more.

Enables AI agents to act as a state-driven tutoring engine over MCP, with server-side mastery estimation, prerequisite checks, evidence-based assessment, and FSRS spaced review scheduling.

Enables MCP-compatible clients to discover and use The Holistic Care's approved public mindfulness resources, including interactive games, guided audio practices, research summaries, a glossary, and the public PanchaVikas framework, through read-only tools and static resources. No authentication is required, and it wraps a public REST API without creating, modifying, or deleting anything.

Enables portable English language instruction through MCP, owning learner identity, curriculum, and learner model while any host LLM delivers conversational teaching, sessions, and assessment.

Enables students to locally archive and read their own course assignments, deadlines, original and graded PDFs, rubric feedback, comments, and submission history through a read-only MCP connection. Supports course and assignment summaries, document reading with OCR, change tracking, and scheduled syncs.

Enables AI clients to query University of Maryland data and services, including course catalogs, grade distributions, sections and instructors, dining menus, Shuttle-UM routes, athletics, campus events, and the campus directory. Supports signing in with a UMD Directory ID so students can access personalized Schedule of Classes, Testudo, and ELMS information.

Provides secure access to Exegol penetration testing tools for CTF competitions and red team learning. Enables AI assistants to perform web penetration testing, network reconnaissance, password cracking, OSINT analysis, and more for educational purposes.

An educational MCP server example demonstrating how to build a server that integrates with LLM clients like Claude Desktop.

Rabbithole provides an infinite canvas for learning by allowing users to open documents, select text, ask questions, and receive answers that open as child documents, all running locally via an MCP server.

Helps independent inventors calculate USPTO fees, determine entity status, track patent deadlines, and understand procedural rules without needing an attorney.

MCP server over the open index of 1,562 certification exam blueprints across 217 certifying bodies. Search exams, pull full blueprints (domains & weights, passing scores, prerequisites, renewal), and compare certifications. Read-only, public data, no API key.

Enables querying of a locally pinned snapshot of the Education-to-Workforce Indicator Framework — 99 indicators and 11.8M observations — to browse questions, describe metrics, resolve places, and fetch or rank data across national, state, county, and district levels.

An MCP server that enables MCP clients to directly access and process arXiv papers by fetching the LaTeX source, improving mathematical content understanding.

An interactive flashcard MCP App for Claude Desktop. Claude generates flashcards from your request or the conversation and renders them as an inline, gradeable flip-card review with spaced repetition.

Enables LLMs to browse and retrieve tasks from the FIPI EGE open bank, including subject listing, task search with metadata and LaTeX-formatted conditions, and automated answer checking for short-answer questions.

Render music notation from a JSON score to inline SVG (Verovio + Bravura), round-trippable MusicXML, and base64 MIDI in one call. Includes pre-flight validation with concrete fix suggestions and a curated music-theory knowledge search. Free, open, no auth, sponsored by Gradus School of Music Composition.