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Hermes Agent

Personal Agents

Nous Research's self-hosted personal agent with a self-improving skill loop.

Open source★ 251,248Caveat

n8n

Runtime & Orchestration

Workflow automation platform with 400+ integrations and agent nodes.

Source-available★ 206,625Caveat

Dify

Runtime & Orchestration

Open-source LLM app platform with built-in RAG, workflows and agents.

Source-available★ 157,815Caveat

Langflow

Runtime & Orchestration

Visual canvas for building LangChain-based agents, exportable as an API or MCP server.

Open source★ 155,496

MCP Reference Servers

MCP & Tooling

The official reference MCP server collection maintained by the MCP steering group.

Open source★ 90,998Caveat

Daytona

Execution Sandbox

Agent sandboxes with independent kernel per sandbox and sub-90ms snapshot resume.

Open source★ 71,667Archived

Mem0

Memory & State

Open-source and hosted memory layer that gives agents persistent cross-session memory.

Open source★ 66,556

Microsoft AutoGen

Runtime & Orchestration

Microsoft's pioneering multi-agent conversation framework, now in maintenance mode.

Open source★ 61,251Caveat

CrewAI

Runtime & Orchestration

Role-based multi-agent orchestration framework in Python.

Open source★ 59,331

Flowise

Runtime & Orchestration

Visual agent builder acquired by Workday; the repository has been archived.

Open source★ 55,489Archived

LlamaIndex

Runtime & Orchestration

Data framework for LLM apps with agent workflows and 300+ integrations.

Open source★ 52,405

LangGraph

Runtime & Orchestration

Graph-based agent runtime by the LangChain team with native durable execution and human-in-the-loop.

Open source★ 42,699Caveat

Agno

Runtime & Orchestration

Agent framework with an AgentOS runtime and control plane, formerly Phidata.

Open source★ 42,545

Firecracker

Execution Sandbox

AWS's open-source microVM monitor powering Lambda and Fargate.

Open source★ 37,138

Langfuse

Observability

Open-source LLM observability and evaluation, acquired by ClickHouse in 2026.

Open source★ 35,358Caveat

Qdrant

Memory & State

Rust vector search engine with HNSW and payload filtering, used for agent memory.

Open source★ 34,923

Cognee

Memory & State

AI memory combining knowledge graphs with vector storage.

Open source★ 31,345

smolagents

Runtime & Orchestration

Hugging Face's minimal agent library built around CodeAgent.

Open source★ 29,667

Chroma

Memory & State

Open-source embedding database used as an agent memory store.

Open source★ 29,435

Microsoft Semantic Kernel

Runtime & Orchestration

Microsoft's enterprise SDK for LLM orchestration, now in maintenance mode.

Open source★ 28,624Caveat

FastMCP

MCP & Tooling

Pythonic framework for building MCP servers and clients.

Open source★ 27,969

Haystack

Runtime & Orchestration

deepset's production LLM framework; v3 adds agent loops and tool execution.

Open source★ 26,646

Letta

Memory & State

Open-source framework for stateful agents, formerly MemGPT.

Open source★ 25,025

Opik

Observability

Comet's open-source LLM observability, evaluation and agent tracing platform.

Open source★ 22,370Caveat

Google ADK

Runtime & Orchestration

Open-source Agent Development Kit that deploys natively to Vertex AI Agent Engine.

Open source★ 21,702

gVisor

Execution Sandbox

Google's user-space application kernel for workload isolation, delivered as the runsc OCI runtime.

Open source★ 19,501Caveat

Weaviate

Memory & State

Open-source vector database storing objects and vectors with hybrid search.

Open source★ 16,864

NVIDIA OpenShell

Execution Sandbox

Policy-governed agent runtime that blocks all outbound network traffic by default.

Open source★ 14,749Caveat

E2B

Execution Sandbox

Open-source Firecracker microVM sandboxes for AI agent code execution.

Open source★ 14,150Caveat

Microsoft Agent Framework

Runtime & Orchestration

The unified successor that merges AutoGen and Semantic Kernel; reached 1.0 GA in April 2026.

Open source★ 13,937

CubeSandbox

Execution Sandbox

Tencent Cloud's open-source microVM agent sandbox, E2B-SDK compatible.

Open source★ 12,798Caveat

Arize Phoenix

Observability

OpenTelemetry-based LLM tracing and evaluation, licensed under ELv2.

Source-available★ 11,703Caveat

mcp-use

MCP & Tooling

Full-stack MCP framework for building MCP apps, clients and servers.

Open source★ 10,714

Model Context Protocol (MCP)

MCP & Tooling

Anthropic's open tool/context protocol, now hosted by the Linux Foundation's Agentic AI Foundation.

Open source★ 9,376Caveat

Kata Containers

Execution Sandbox

OCI-compatible VM isolation that can drive QEMU, Cloud Hypervisor or Firecracker.

Open source★ 8,874

microsandbox

Execution Sandbox

Self-hosted, local-first microVM sandboxes with OCI image compatibility.

Open source★ 8,555Caveat

Claude Agent SDK

Runtime & Orchestration

Anthropic's SDK for building agents on the Claude Code harness.

Open source★ 8,215

Official MCP Registry

MCP & Tooling

The authoritative registry for publicly available MCP servers.

License unclear★ 7,314Caveat

Cloud Hypervisor

Execution Sandbox

KVM-based Rust VMM built on rust-vmm, dual-licensed Apache-2.0 / MIT.

Open source★ 6,285

Helicone

Observability

Apache-2.0 LLM observability proxy, now reported to be in maintenance mode.

Open source★ 6,199Caveat

Vercel Eve

Runtime & Orchestration

Filesystem-first agent framework by Vercel: an agent/ directory is the agent.

Open source★ 5,455Caveat

Agent Substrate

Execution Sandbox

High-density runtime that multiplexes many stateful agents onto few Kubernetes workers.

Open source★ 4,248Caveat

SPIFFE / SPIRE

Identity & Permission

CNCF-graduated workload identity standard and its reference implementation.

Open source★ 2,569

Stripe Agent Toolkit

Payment Infrastructure

Stripe's open-source toolkit for giving agents payment and billing tools.

Open source★ 1,853

Fly.io Machines

Execution Sandbox

Firecracker microVMs with suspend/resume across 18+ regions.

Proprietary★ 1,717Caveat

Coinbase AgentKit

Payment Infrastructure

Framework-agnostic toolkit giving agents on-chain wallet actions.

Open source★ 1,322Caveat

Weights & Biases Weave

Observability

W&B's agent tracing and evaluation toolkit, SDK under Apache-2.0.

Proprietary★ 1,135

Braintrust

Observability

Eval-first AI observability platform with an open-source autoevals library.

Proprietary★ 1,044Caveat

Smithery

MCP & Tooling

MCP server registry and gateway with managed OAuth and persistence.

Proprietary★ 840Caveat

ClawMetry

Observability

Local-first observability dashboard for coding-agent runtimes such as OpenClaw.

Open source★ 424Caveat

Vercel Sandbox

Execution Sandbox

Ephemeral Firecracker microVMs on Vercel, one per sandbox.

Proprietary★ 208Caveat

AGNTCY Agent Identity

Identity & Permission

Linux Foundation-hosted identity service for agents, MCP servers and multi-agent systems.

Open source★ 67Caveat

Nutanix MCP Server

MCP & Tooling

Open-source MCP server exposing Nutanix Cloud Platform via the Prism v4 API.

Open source★ 23Caveat

Agent Identity Protocol (AIP)

Identity & Permission

An IETF Internet-Draft proposing agentic authentication and policy enforcement, submitted with NVIDIA involvement.

Standard / specCaveat

Amazon Bedrock AgentCore Payments

Payment Infrastructure

Managed micropayments capability within Amazon Bedrock AgentCore, GA in August 2026.

Proprietary

Auth0 for AI Agents

Identity & Permission

Auth0's agent auth suite: user login, delegated authorization and token vault.

ProprietaryCaveat

Circle Agent Stack

Payment Infrastructure

Circle's full-stack platform for the agentic economy, native to USDC and x402.

Proprietary

Deno Sandbox

Execution Sandbox

Deno's managed microVM sandboxes with credential and egress controls.

ProprietaryCaveat

Glama MCP Directory

MCP & Tooling

Third-party MCP server directory with quality grading and an online inspector.

ProprietaryCaveat

Grafana Agent Observability

Observability

Grafana Cloud's agent observability built on OpenTelemetry gen_ai spans.

Proprietary

Grok Bot

Personal Agents

Always-on managed personal agent from SpaceXAI, formerly xAI.

ProprietaryCaveat

Honeycomb Agent Observability

Observability

Honeycomb's agent observability with Agent Timeline, built on OTel GenAI conventions.

ProprietaryCaveat

K8E

Execution Sandbox

A k3s-derived Kubernetes distribution, repositioned in 2026 as an agent sandbox matrix.

Open sourceCaveat

LangSmith

Observability

LangChain's proprietary tracing, evaluation and monitoring platform.

ProprietaryCaveat

Manus

Personal Agents

Managed general-purpose agent service from Singapore's Butterfly Effect.

ProprietaryCaveat

Mastra

Runtime & Orchestration

TypeScript agent framework with workflows, RAG and eval primitives.

Open sourceCaveat

Meta Muse

Personal Agents

Meta's consumer personal agent running on a per-user secure VM.

ProprietaryCaveat

Microsoft Entra Agent ID

Identity & Permission

Agent identity objects inside the Microsoft Entra suite, tied to Agent 365.

Proprietary

Modal Sandboxes

Execution Sandbox

Managed container-based sandboxes on Modal, isolated with gVisor.

ProprietaryCaveat

OAuth 2.1 + MCP Authorization

Identity & Permission

The open authorization stack MCP servers are expected to implement.

Standard / specCaveat

Okta for AI Agents

Identity & Permission

Okta's agent identity and governance offering, GA in April 2026.

ProprietaryCaveat

OpenAI Agents SDK

Runtime & Orchestration

OpenAI's production agent framework, the successor to Swarm.

Open source

OpenAI dots

Personal Agents

OpenAI's managed personal agent with its own always-on cloud computer.

ProprietaryCaveat

OpenClaw

Personal Agents

Self-hosted open-source personal agent runtime with a skill marketplace.

Open sourceCaveat

OpenMHP

MCP & Tooling

An MCP server giving agents safe control of laboratory instruments.

Open sourceCaveat

PEDIGREE

Identity & Permission

An IETF Internet-Draft extending SPIFFE with per-agent delegation and scope reduction.

Standard / specCaveat

Pydantic AI

Runtime & Orchestration

Type-safe Python agent framework that validates LLM output with Pydantic.

Open source

Tempo

Payment Infrastructure

A payments-first EVM Layer 1 incubated by Stripe and Paradigm.

Open sourceCaveat

x402

Payment Infrastructure

Open payment protocol reviving HTTP 402, now governed by the Linux Foundation.

Standard / specCaveat

Zep

Memory & State

Agent memory platform built on Graphiti, a temporal knowledge graph engine.

ProprietaryCaveat