"Free tools or resources that do not require an API" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Check an A2A agent before you delegate, or an MCP server's measured conduct. Free, no key.
Traffic Parrot simulates APIs and messaging. Request or withdraw a trial, read docs, send feedback.
Connect Claude, ChatGPT, Cursor or any MCP client to Ybug. Read bug reports with screenshots, console logs and network requests, then triage them in chat.
Generate structurally valid test IBANs for 91 countries (MOD-97 and national check digits), validate any IBAN and export lists. Free, no sign-up.
Validate and clean CSV before import. Find duplicates, missing values and invalid dates with row-level reports. Apply only the cleanup you request; files are not retained. Run view_csv_demo free without a key. Custom CSV: EUR 9 for 100 operations, valid 90 days, no subscription. Setup: https://check.orvel.dev/docs/
Free AI test helpers: injection inputs, OWASP mapping, release plans, response and tool-call packs.
Lint a SKILL.md for frontmatter, structure, secrets and size. All 6 tools free.
Risk-scan a diff, flag AI-generated-code tells, find secrets. 5 of 7 tools need no account.
Simulate cloud architectures before provisioning. 9 free demo tools; an API key unlocks all 62.
Test and debug your AI agent's Web Bot Auth (RFC 9421) signature: is it valid, and what to fix?
Create and manage test cases, test runs and results in Testiny from your AI assistant.
Deterministic JSON, routing and verification tools for AI agents, paid via x402 USDC on Base.
Diagnose why an AI agent failed and get the verified fix instantly. Free, no token.
Validate CSV columns, find duplicates and invalid values, and clean files with explicit rules. Row-level reports, no stored files. Run the fixed free sample without a key. Custom CSV: EUR 9 for 100 operations, valid 90 days, no subscription. Setup: https://import-check-production.up.railway.app/docs/
Paid deterministic data-quality and execution-verification tools for AI agents.
Scan URLs or HTML for WCAG 2.2 accessibility violations. 75-rule manifest, severity-weighted score, shareable HTML/CSV/JSON reports. Tools: scan_url, scan_html, get_report, list_rules.
Parse WebVTT, SRT, or TTML for conformance, timing, overlaps, line length, and reading speed.
Zero-config agent-readiness auditor and Flight Simulator tools for AI coding agents
Pine Script backtest-trap checks, backtest reconciliation and official Korean finance data.
Uxia brings AI user testing, usability testing and UX research into ChatGPT. It helps product managers, UX designers, researchers and developers evaluate websites, interactive prototypes and digital product experiences using AI-simulated users. Explore potential usability problems, investigate friction in user journeys and use findings to guide product and design improvements.
