"Free servers available for testing purposes" matching MCP connectors:

Free US cleaning cost, time, crew, and chemical-use calculators with visual reports.

OWID MCP — Our World in Data chart/indicator access (free, no auth)

JPL-referenced Human Design charts for AI agents: bodygraph, transit, composite, Penta, DreamRave.

SaaS runway calculator (MRR growth vs churn), breakeven, burn multiple. Free MCP connector.

Insights for your iFood store right in your AI assistant's chat. Generate charts of sales and payout

MCP server for YAML: validate & lint, convert between 10 formats, visualize as diagrams, and create/edit your saved diagrams — from your AI editor.

Visual AI for strategic thinking — SWOT, flowcharts, mindmaps, Gantt diagrams as polished SVG.

Display delivery platform for AI agents. Push HTML, dashboards and live data to screens.

Search, query, and visualize 2,300+ public datasets from World Bank, IMF, Eurostat, OECD, WHO, and more. Publish charts with real verified data. 12 tools for data discovery, analysis, and visualization.

AI-powered 3D globe control via MCP. 43 tools for CesiumJS — camera flight, GeoJSON/3D Tiles layers, entities, animation, spatial analysis, heatmaps, and more. Connect any MCP-compatible AI agent to control a CesiumJS 3D globe through natural language.

clariBI is an AI-powered business intelligence platform built for small and mid-sized SaaS, ecommerce, and operations teams. Instead of writing SQL or building dashboards manually, users ask questions in plain English ("what's our CAC by channel last quarter?") and the AI engine pulls the data from Stripe, HubSpot, Google Analytics, ad platforms, Jira, and 30+ other sources via the open Model Context Protocol. Dashboards generate themselves on source connect.

Our free Marketgenius investment tools as live, interactive React MCP Apps.

Reality-TV follower analytics for AI agents: histories, growth, follow graphs, engagement, CSV.

Cutlist optimization for sheet, linear and roll stock, with grain, kerf, nesting and saw exports.

The all-in-one data stack for agents. Upload files, run SQL, evolve tables, and render charts.

Norges Bank exchange rates for your AI — 38 currencies vs NOK, history to 1980, convert & chart

Privacy-first, cookie-free web analytics: create sites, install and verify tracking, read stats.

Generate Tableau .twb/.twbx workbooks: 47 tools for charts, dashboards, rules, CSV pipelines.

Bar-first MCP server for Tabula chart authoring, PNG rendering, and editor handoff.

Create and manage Gantt project charts directly from Claude — add tasks and milestones, link all four dependency types, duplicate/share charts, and export to Markdown, CSV, Mermaid, or .gantt. Backed by the free, no-signup ganttchartmaker.app, with cloud save and real-time collaboration.