"Tools or methods for learning and visualizing concepts with diagrams" matching MCP servers:

• digit-tools

  digitable-lol

  A

  license

  -Not graded

  quality

  C

  maintenance

  MCP stdio server that exposes 95 headless it-tools utilities (crypto, encoding, converters, generators, text, math, and more) through three routing tools (categories, list, execute), with flat JSON schemas, worked examples, and deterministic seeded execution designed for small router models.

  Updated 23 days ago (2026-08-03 18:33 UTC)

  GPL 3.0

• MCP Character Tools

  Aaryan-Kapoor

  A

  license

  A

  quality

  C

  maintenance

  Provides 14+ character-level text analysis tools that give LLMs the ability to accurately count letters, analyze individual characters, and work with text at the character level—overcoming tokenization limitations.

  Updated 8 months ago (2025-12-13 08:42 UTC)

  14

  16

  3

  MIT

• ytb-tools

  aliildan

  A

  license

  A

  quality

  B

  maintenance

  Enables AI assistants to search YouTube, fetch transcripts, and get AI summaries of videos without API keys.

  Updated 2 months ago (2026-06-30 00:46 UTC)

  3

  12

  MIT

• mcp-pdf-tools

  seraphinerenard

  A

  license

  A

  quality

  -Not graded

  maintenance

  An MCP server that enables users to read, search, and analyze PDF documents. It provides tools for extracting text, viewing metadata, searching content with context, and generating word statistics.

  Updated 7 months ago (2026-01-29 18:31 UTC)

  5

• YouTube for AI Agents

  JCodesMore

  A

  license

  -Not graded

  quality

  D

  maintenance

  Enables AI agents to search, watch, summarize, clip, and extract transcripts from YouTube videos, all without needing an API key or leaving the chat.

  Updated 4 months ago (2026-04-30 11:39 UTC)

  13

  45

  Apache 2.0

• PDF Tools

  Open-Document-Alliance

  A

  license

  -Not graded

  quality

  A

  maintenance

  The local PDF workflow for Claude Desktop and MCP hosts: fill, sign, merge, split, extract, and analyze PDFs without sending files to a web app.

  Updated 3 days ago (2026-08-24 13:35 UTC)

  3

  152

  MIT

• mcp-regex-tools

  rog0x

  A

  license

  -Not graded

  quality

  D

  maintenance

  Provides a suite of regex and text processing tools for AI agents, including pattern testing, extraction, and replacement with capture group support. It also enables various text transformations like case conversion, line sorting, and deduplication through the Model Context Protocol.

  Updated 5 months ago (2026-03-21 20:21 UTC)

  38

  MIT

• mcp-tools-server

  Mani9333

  F

  license

  -Not graded

  quality

  D

  maintenance

  An MCP server that provides developer knowledge and utility tools including local documentation search, text summarization, safe arithmetic calculation, unit conversion, and knowledge-base resources.

  Updated 22 days ago (2026-08-04 20:54 UTC)

• Study Tools MCP

  francis-rf

  A

  license

  B

  quality

  C

  maintenance

  An AI-powered study assistant that generates quizzes, flashcards, summaries, and concept explanations from study materials using the Model Context Protocol.

  Updated 5 months ago (2026-03-28 02:18 UTC)

  6

  MIT

• Steam Review and Forum MCP

  icue

  A

  license

  -Not graded

  quality

  B

  maintenance

  Enables exploring Steam store reviews and community discussion threads with server-side filtering, temporal analysis, and metadata context for understanding player sentiment and feedback beyond store page noise.

  Updated 2 months ago (2026-07-02 03:46 UTC)

  25

  1

  BSD 3-Clause

• Mattermost Workflows for Codex

  shanginn

  F

  license

  -Not graded

  quality

  B

  maintenance

  A local-first Codex plugin that bundles an MCP server to safely interact with Mattermost, enabling channel/thread summarization, conversation search, and reviewed post publishing via the Mattermost REST API.

  Updated a month ago (2026-07-16 06:19 UTC)

• Claude Assistant for

  jedbillyb

  F

  license

  -Not graded

  quality

  A

  maintenance

  Enables Claude to read, rewrite, generate, and summarize LibreOffice Writer documents with preview-then-apply editing through MCP tools, authenticating via Claude Code login.

  Updated 16 days ago (2026-08-11 10:23 UTC)

• MCP Server with Local LLM

  0xsaju

  F

  license

  -Not graded

  quality

  D

  maintenance

  Integrates local language models (like Qwen3-8B) with MCP clients, providing tools for chat, code analysis, text generation, translation, and content summarization using your own hardware.

  Updated a year ago (2025-09-25 05:10 UTC)

• Multi-Agent Tools Platform

  kingrishabdugar

  F

  license

  -Not graded

  quality

  D

  maintenance

  A modular production-ready system that provides specialized agents for math, research, weather, and summarization tasks through a unified MCP toolbox with smart supervisor capabilities.

  Updated a year ago (2025-06-22 07:22 UTC)

• Bilibili Mcp Server

  XZXZZX-Ai

  A

  license

  A

  quality

  A

  maintenance

  ✨ 为你的 AI 助手装上 B 站的眼睛：一键提取视频字幕与热门评论，助力高效信息总结 🚀 ✨ Equip your AI assistant with "Bilibili Eyes": One-click extraction of video subtitles and popular comments for efficient information summarization 🚀

  Updated 3 days ago (2026-08-24 06:29 UTC)

  12

  580

  14

  GPL 3.0

• YouTube Transcript MCP Server

  Ayaanisthebest

  A

  license

  A

  quality

  D

  maintenance

  Enables fetching, searching, and summarizing YouTube video transcripts with multi-language support.

  Updated a year ago (2025-09-11 21:21 UTC)

  4

  MIT

• Sentiment By Api Ninjas MCP

  BACH-AI-Tools

  A

  license

  A

  quality

  D

  maintenance

  Enables sentiment analysis of text blocks using the Api Ninjas API, returning sentiment scores and overall sentiment classification for up to 2000 characters of text.

  Updated 9 months ago (2025-12-07 22:50 UTC)

  1

  MIT

• MCP DeepInfra AI Tools Server

  phuihock

  F

  license

  A

  quality

  F

  maintenance

  Provides various AI capabilities through DeepInfra's OpenAI-compatible API including image generation, text processing, embeddings, speech recognition, object detection, and classification tasks. Enables users to access multiple AI models for diverse tasks like generating images from prompts, transcribing audio, analyzing text sentiment, and performing computer vision operations.

  Updated 10 months ago (2025-10-23 03:10 UTC)

  10

  2

• Drupal-Modules-MCP MCP Server

  Cleversoft-IT

  A

  license

  B

  quality

  D

  maintenance

  This TypeScript-based MCP server allows users to manage and interact with a note system through Model Context Protocol, enabling note creation and summarization with URIs and metadata.

  Updated 2 years ago (2025-02-07 18:51 UTC)

  1

  MIT

• aws-helper MCP Server

  eunyuljo

  A

  license

  C

  quality

  D

  maintenance

  A Model Context Protocol server that implements a simple notes system, allowing users to create, list, and summarize text notes.

  Updated a year ago (2025-06-12 02:39 UTC)

  3

  6

  ISC