Free AI Coding Tools
Free AI coding tools — 8 curated editors, agents, CLIs, and MCP servers with notes on what each does best and how it fits your development stack.
Arize Phoenix
A source-available (Elastic License 2.0) LLM observability and evaluation tool built on OpenTelemetry, runnable anywhere.
Claude Agent SDK
A toolkit for building custom agents on the same harness that powers Claude Code.
Cloudflare MCP
Cloudflare's official MCP servers — a Code Mode server covering 2,500 API endpoints in ~1k tokens, plus hosted servers for docs, Workers, and observability.
Crush
Charm's terminal coding agent: nearly any model, including local ones, switched mid-session, with LSP context, MCP and Agent Skills. Source-available (FSL).
DeepWiki MCP
Cognition's free, no-auth remote MCP server for DeepWiki: generated wikis and grounded Q&A for any public GitHub repository, from inside your agent.
Linear MCP
Linear's hosted MCP server — find, create, and update issues, projects, and comments from your AI agent, with OAuth and one-command setup.
Sentry MCP
Sentry's hosted MCP service for debugging — pull issues, events, traces, and releases into your agent, and trigger Seer root-cause analysis.
Stripe MCP
Stripe's official MCP server — customers, invoices, payment links, subscriptions, refunds, and docs search for agents, hosted at mcp.stripe.com.