MIT agent runtime. Pay model API only. Live Flash peak $0.44/$1.32 per 1M, not the old $0.14/$0.28 row.

Open multi-agent framework. CLI is $0 + BYOK. MGX is now Atoms: Free $0 / Pro from $20.

nanobot is an ultra-lightweight, self-hosted Python agent framework with a WebUI, long-term memory, MCP integrations, and scheduled automation.

MIT agent framework. Hosted traces are LangSmith Developer $0 / Plus $39 per seat. Not LangServe-as-the-product.

Craft Agents is an open-source AI agent framework from Luki Labs for agent orchestration, workflow management, and multi-agent collaboration.

Eve is Vercel's open framework for production AI agents: Markdown instructions and skills, TypeScript tools, and durable workflows by default.

Link Agents is an open-source fork of Craft Agents with a GUI for Skills management and session import/export, tuned for Claude Code workflows.

Meland Labs workspace that turns expert methods into a self-evolving digital employee. Early access v0.6.1. Free, Basic $15/mo, Pro $39/mo.

Open-source Rust framework and optional durable platform for building AI agents with typed tools, persistent sessions, and controlled production channels.

Anthropic's official plugin pack for finance: reference agents and skills for pitch decks, DCF/LBO models, earnings review, and GL reconciliation.

Self-improving open-source AI agent by Nous Research with a built-in learning loop, multi-channel gateway, and model-agnostic runtime. MIT licensed.

Open-source TypeScript agent framework: agents, workflows, RAG, memory, MCP, and eval with a hosted platform. About 27,437 GitHub stars (2026-08-25).

NVIDIA's open-source agent framework that turns an agent into one Python class: methods are actions, docstrings are prompts, at 82.2% SWE-bench Verified.

Vercel Labs' MIT-licensed reference app for running background coding agents: a web UI, a durable workflow runtime, and isolated sandboxes you can fork.

AWS's batteries-included agent harness: one import gives you a tuned general-purpose agent that the team says runs 28 percent cheaper than Claude Code.

Apodex is a self-evolving research agent that separates reasoner from verifier, with an Agent Team mode, open 35B weights, and the FrontierAgent CLI.