Open-source agent frameworks & browser agents

Langflow

langflow-ai/langflow

Visual drag-and-drop builder for AI agents and RAG workflows that can be served as APIs or MCP servers.

uv pip install langflow -U

LangChain

langchain-ai/langchain

The most widely used framework for building LLM apps and agents in Python (and JS), with hundreds of integrations.

uv add langchain

Browser Use

browser-use/browser-use

Python library that lets AI agents control a real browser to complete web tasks.

uv add browser-use

Mem0

mem0ai/mem0

Memory layer for AI agents and apps: stores and retrieves user/agent context across sessions.

pip install mem0ai

OpenManus

FoundationAgents/OpenManus

Open general-purpose agent framework (browser, code, tools) created as an open take on Manus-style agents.

uv pip install -r requirements.txt

Agno

agno-agi/agno

Python framework and runtime to build, run and manage multi-agent systems with memory and tools.

Install: pip install agno (see docs.agno.com).

UI-TARS Desktop / Agent TARS

bytedance/UI-TARS-desktop

ByteDance’s multimodal agent stack: GUI/computer-use desktop app and Agent TARS CLI for browser and terminal tasks.

npm install @agent-tars/cli@latest -g

DSPy

stanfordnlp/dspy

Framework for "programming, not prompting" LMs: declarative modules plus optimizers that tune prompts automatically.

pip install dspy

Lightpanda

lightpanda-io/browser

Lightweight headless browser built for AI agents and automation, CDP-compatible with Puppeteer/Playwright.

docker run -d --name lightpanda -p 127.0.0.1:9222:9222 lightpanda/browser:latest

Graphiti

getzep/graphiti

Builds real-time, temporal knowledge graphs as long-term memory for AI agents.

pip install graphiti-core

smolagents

huggingface/smolagents

Hugging Face’s barebones Python library for agents that write and execute code as actions.

pip install "smolagents[toolkit]"

Semantic Kernel

microsoft/semantic-kernel

Microsoft’s SDK (C#, Python, Java) for adding LLMs, plugins and agents to apps.

pip install semantic-kernel

Vercel AI SDK

vercel/ai

TypeScript toolkit for building AI apps and agents with streaming UI helpers for React, Next.js, Svelte and more.

npm install ai

Stagehand

browserbase/stagehand

Browser automation SDK mixing code and natural-language actions (act/extract/observe) on top of Playwright.

pnpm add @browserbasehq/stagehand 'zod@~4.4.3'

Skyvern

Skyvern-AI/skyvern

Automates browser-based workflows (forms, portals) with LLMs and computer vision instead of brittle selectors.

pip install "skyvern[all]"

Agent Development Kit (ADK)

google/adk-python

Google’s code-first Python toolkit for building, evaluating and deploying AI agents.

pip install google-adk

Pydantic AI

pydantic/pydantic-ai

Type-safe Python agent framework from the Pydantic team, model-agnostic with structured outputs.

uv add pydantic-ai

Outlines

dottxt-ai/outlines

Guarantees structured LLM output (JSON schema, regex, grammars) during generation.

pip install outlines

Nanobrowser

nanobrowser/nanobrowser

Chrome extension that runs multi-agent web automation in your own logged-in browser with your own API keys.

Install: Install from the Chrome Web Store.

Instructor

567-labs/instructor

Get validated, structured (Pydantic) outputs from any LLM with retries.

pip install instructor

Strands Agents

strands-agents/harness-sdk

Model-agnostic SDK (Python & TypeScript) from AWS for building production AI agents.

pip install strands-agents strands-agents-tools