Best AI Developer Tools
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Cleo
Cleo is an open-source package manager for Claude Code that installs rules, skills, agents, and MCP servers with lock-file pinning. Free, GPL-3.0.Free plan
Claude Opus 4.8
Claude Opus 4.8 is Anthropic's AI model with Effort Control and parallel subagents; $5/M input, $25/M output, same price as Opus 4.7.From $5/mo
CLAUDE.md Rules Pack
CLAUDE.md Rules Pack is a Claude Code template and hooks bundle that enforces your coding rules; full contents and price are on Gumroad.Dux Data
Dux Data provides free pricing benchmarks and cost calculators for engineering leaders comparing various AI platforms.Free plan
Mailto.Bot
Mailto.Bot is an email API for developers and AI agents — one API call creates a working mailbox. Free tier includes 3 mailboxes and 1,000 messages/month.Free plan
Macrokit Studio
Macrokit Studio is a free AI developer tool SDK that routes GitHub tasks to pre-authored macros via a tiny local model — no API key or cloud needed.
etrace: open source minimal tracing lib
etrace is an open-source AI agent tracing library that auto-instruments LLM calls and tracks costs across 1,700+ models, MIT licensed.Free plan
Cheap AI Tools Directory
Cheap AI Tools Directory lists affordable and free AI APIs — OpenAI, Claude, HuggingFace, Perplexity — with pricing tiers for budget side projects.
Chameleon
Chameleon is an open-source AI LLM runtime that loads, runs, and unloads models on demand to save VRAM, with dynamic routing. MIT-licensed and free.
Callable
Callable is an AI agent tool that sends a human to clear KYC, sign-ins, and CAPTCHAs, returning JSON + screenshot proof in 30 minutes for $39/task.
Bugpilot
Bugpilot is an AI error-tracking tool for React apps with no-code setup, readable stack traces, session replay, and GPT-4 AI-assisted debugging.
Bot Trade
Bot Trade is an AI trading agent benchmarking platform that tests autonomous agents on frozen market data with reproducible Sharpe and drawdown metrics.