"Free and open-source coding assistants" matching MCP connectors:

Serves your design system and coding standards to coding agents, so they stop guessing.

The OpenRouter MCP server plugs OpenRouter into the AI tools you already use. Once connected, your assistant can pull live OpenRouter data (models, prices, your credits, rankings, and docs) and send quick test messages, all without leaving your editor.

Federated search of books and papers, BibTeX/RIS citations, open-access retrieval and reading.

Website QA for your coding agent: audit SEO, performance, security, accessibility over MCP.

Helena Bioinformatics MCP for clinical variant interpretation, ACMG/AMP evidence and literature.

Live censorship, China economic, and tamper-evident AI evaluation tools with bounded analysis.

We buy from x402 endpoints with real USDC and publish delivery outcomes. Check before you spend.

Search Vascue's public healthcare-ops, insurance-claims and booking docs. Public content only.

Convert PDF bank statements into structured transactions, accounts, and balances.

Ask Taokeh — your AI runs a Malaysian SME's books, you approve. 56 tools: read everything (P&L, balance sheet, cash with an honest liquid total, AR/AP aging, per-channel sales, payroll summaries, tax position, a one-call daily brief), file drafts (invoices, bills, expenses, quotes, receipts, journals, credit/debit notes, POs, contacts), propose changes to existing records (contacts, products, employees, recurring templates — always as a current→proposed diff a human approves), import bank and credit-card statements, and migrate a whole back-book through staged review. Nothing posts without a human tap. Bahasa Malaysia and English. RM29/mo on any Taokeh plan.

Conformance checker for MCP servers. Free, no key, verdicts recomputable and re-measured daily.

Twenty-two paid x402 and MPP tools for agent discovery, payment safety, data, and DeFi.

The adaptive health-messaging engine for apps and agents. Federally-sourced. Not medical advice.

Verify claims, resolve FIGI identity, extract claims, and sign x402 delivery receipts over MCP.

Micro-settled web content extraction and JSON schema validation utilities for AI agents and MCP clients, backed by the Bristlecone Logic API engine.

Find your AI agent's likely failure mode, get runtime settings, and clarify ambiguous prompts.

Agent intake desk for property renovation. Read only, CORS open, fail closed, receipts recompute.

Cite and independently verify Bitcoin-anchored construction-estimate audit records.

Search domain availability and pricing, straight from chat, then open a link to register.

Money, FX, capital-market and metadata-only China macro evidence with source clocks and limits.