Best AI Agents

Letta alternatives

10 other agent infra listed here. Letta is open source.

Featured

Model Context Protocol

Agent infra

Open protocol for connecting models to tools and data

Open sourceprotocolmcp

Agent2Agent Protocol

Agent infra

Open protocol for agents to talk to each other

Open sourceprotocola2a

Arize Phoenix

Agent infra

Open source tracing and evaluation for LLM apps

Open sourceobservabilityevals

Composio

Agent infra

Tool and integration layer for agents

Freemiumtoolsintegrations

E2B

Agent infra

Cloud sandboxes for running agent-generated code

Open sourcesandboxcode-execution

Firecrawl

Agent infra

Turns websites into clean data for LLMs

Open sourcescrapingcrawling

Langfuse

Agent infra

Open source LLM observability and prompt management

Open sourceobservabilitytracing

LangSmith

Agent infra

Tracing, evals and monitoring for LLM apps

Freemiumobservabilitytracing

Mem0

Agent infra

Memory layer for AI agents and apps

Open sourcememorypersonalization

Tavily

Agent infra

Search API built for AI agents and RAG

Freemiumsearchapi