Free Graph and Network Visualization Tools (No API Key Required)

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Free Graph and Network Visualization Tools (No API Key Required)

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Why this server?
Open-source, local-first network diagram editor with smart auto-layout and no API key required.
NetMap — Network Diagram MCP
Networking & Infrastructure Developer Tools Command Line
den-indance
A
license
-
quality
B
maintenance
Visual network topology editor with AI agent integration via MCP. One-click SSH + web-service access from any node, nmap/CSV import, smart auto-layout, multi-sheet, local-first. Open-source successor to netViz (CA Technologies 1990-2012)
Last updated 2026-05-25
125
MIT
Why this server?
Local-first code graph server with 18 tools for structural code queries, no API key needed.
polycodegraph
Code Analysis Developer Tools
smochan
A
license
-
quality
B
maintenance
Multi-language code-graph MCP server with 18 tools for structural code queries — find_symbol, callers, callees, blast_radius, dead_code, and cross-stack dataflow_trace from HTTP request through service layers to SQL. Tree-sitter parsing for Python, TypeScript, JavaScript, and Go; local-first, no API key required.
Last updated 2026-06-22
11
MIT
Why this server?
Local-first knowledge graph server, no cloud or authentication required, easy to use without API keys.
filamental-mcp
Knowledge & Memory Note Taking
Scottnine
A
license
-
quality
A
maintenance
Search, traverse and edit your Filamental knowledge graph from any MCP-compatible AI client. Local-first, no cloud, no auth required. 12 tools for reading and writing nodes and edges.
Last updated 2026-07-12
MIT
Why this server?
Generates mind maps from Markdown locally with no external services or API keys, ensuring privacy.
Mind Map MCP Server
Image & Video Processing Developer Tools
sawyer-shi
F
license
-
quality
D
maintenance
Generates beautiful mind map images from Markdown text with multiple layout options, running completely locally with no external services or API keys required for full data privacy.
Last updated 2025-12-15
3
Why this server?
Creates and visualizes network diagrams via real-time web interface and REST API, no API key mentioned.
Network Diagram MCP Server
Software Architecture Developer Tools App Automation
Fogrexon
F
license
-
quality
D
maintenance
Creates and visualizes network diagrams through MCP tools for adding nodes and edges, with real-time web interface and REST API for building architecture diagrams interactively.
Last updated 2025-12-26
Why this server?
Provides state/decision graph creation and visualization using NetworkX, with PNG export or web interface, no API key.
NetworkX Graph MCP Server
Developer Tools Software Architecture
inbarajaldrin
A
license
C
quality
D
maintenance
Enables creation and management of state/decision graphs using NetworkX, supporting directed graphs with conditional branches, edge ordering, path finding, and visualization through PNG exports or interactive web interface.
Last updated 2025-12-16
24
MIT
Why this server?
Deterministic graph-theory tools for structural analysis with no AI, suitable for algorithmic graph visualization.
endiagram
Software Architecture Developer Tools
dushyant30suthar
A
license
B
quality
D
maintenance
12 deterministic graph-theory tools for structural analysis. Describe systems in EN syntax (subject do: action needs: inputs yields: outputs) — get topology, bottlenecks, blast radius, critical paths and lot more. No AI inside the computation.
Last updated 2026-04-21
12
142
8
MIT
Why this server?
Zero-dependency charting for Python and AI agents, producing SVG/PNG with a one-line MCP server, no API key.
Charted
Data Visualization AI & Machine Learning
marzukia
A
license
A
quality
A
maintenance
Zero-dependency charts for Python and AI agents. SVG and PNG, 15 chart types, a one-line MCP server, and a Claude skill.
Last updated 2026-07-12
4
9
MIT
Why this server?
Generates branded SVGs from structured data without JavaScript or runtime, no API key required.
hyperweave
Data Visualization Design Tools Agent Orchestration
InnerAura
A
license
-
quality
B
maintenance
HyperWeave gives agents a visual output surface: structured data in, branded SVG out. No JavaScript, no runtime. Works anywhere an image can be embedded. Badges, cards, charts, dashboards, diagrams, and more.
Last updated 2026-06-29
24
Apache 2.0