Best of / Open source stacks
Open source stacks
Listings where a substantial client or runtime is publicly licensed. Cloud extras may still be proprietary — read the license field.
Curated by filter, not by score. A listing appears here only if its structured fields match the query. 58 listings.
- Agent Development Kit
Google’s open kit for building Gemini-centered agents.
- Agno
Python multi-agent framework (formerly Phidata).
- Aider
Git-native CLI agent that commits as it works.
- Cline
Open VS Code agent that drives the editor like a human.
- Cloudflare Agents
Agents SDK on Durable Objects — this site’s own job runtime.
- Coder
Self-hosted workspaces on your infrastructure, Terraform-defined.
- Context7
Up-to-date library docs injected into coding agents.
- Continue
Open IDE agents, acquired by Cursor, source still public.
- CrewAI
Role-playing multi-agent framework with a commercial control plane.
- Crush
Charm’s glamorous terminal coding agent.
- Dagger
Programmable CI/CD engine agents can call as a tool.
- Daytona
Workspaces for agents, with a more persistent posture than E2B.
- DeepEval
Pytest-flavored evals for LLM systems.
- Devbox
Nix-powered reproducible shells for humans and agents.
- DSPy
Stanford’s framework for programming — not prompting — LMs.
- E2B
Firecracker microVMs as a sandbox API for AI agents.
- Fern
OpenAPI-to-SDKs and docs, an alternative to Stainless.
- Firecracker
AWS’s microVM monitor that sandbox vendors wrap.
- Gemini CLI
Google’s open-source terminal agent for Gemini models.
- Giskard
Open testing and red-teaming for AI applications.
- Gitpod
Open-source platform for automated, ready-to-code environments.
- Goose
Block’s local-first, open-source agent with recipes.
- Hatchet
Open task queue aimed at durable, observable background jobs.
- Haystack
deepset’s open framework for pipelines, RAG, and agents.
- Helicone
Open LLM gateway with logging, caching, and spend controls.
- Inngest
Event-driven durable functions for product and agent jobs.
- Inspect
UK AISI’s open framework for evaluating language model agents.
- Kilo
Open agent across IDE and CLI, plus a zero-markup model gateway.
- Langfuse
Open-source LLM observability you can self-host.
- LangGraph
Graph runtime for agents, from the LangChain project.
- LangWatch
Observability and evaluation platform for LLM products.
- Letta
Stateful agents with memory, from the MemGPT lineage.
- LlamaIndex
Data framework for LLM apps that grew workflows and agents.
- Mastra
TypeScript agent framework with workflows and evals attached.
- Microsoft Agent Framework
Microsoft’s successor surface for AutoGen-style multi-agent apps.
- n8n
Open workflow automation that now grows agent nodes.
- OpenAI Agents SDK
OpenAI’s official Python/TS SDK for agent loops.
- OpenCode
Open terminal coding agent; Kilo CLI is a downstream fork.
- OpenHands
Open software-agent runtime with a computer you can watch.
- Phoenix
Arize’s open observability and eval notebook for LLM apps.
- Plandex
Open terminal agent that plans large diffs in a sandbox.
- Prefect
Python workflow orchestrator used to schedule agent jobs.
- Promptfoo
Open evals and red-team for LLM apps and agents.
- Pydantic AI
Typed Python agents from the Pydantic team.
- Qodo
Generation and review agents aimed at test-aware pull requests.
- Ragas
Open metrics for RAG and LLM application quality.
- Roo Code
Cline fork aimed at modes, automation, and teams.
- Semgrep
Fast static analysis you can teach, including AI-assisted rules.
- smolagents
Hugging Face’s small, first-class code-agent library.
- Spec Kit
GitHub’s toolkit for spec-driven development with coding agents.
- Steel
Open-source browser sandbox API for AI agents.
- SWE-agent
Princeton’s agent that made SWE-bench a product category.
- Tabby
Self-hosted coding assistant you run like an internal service.
- Temporal
Durable workflow engine that can sequence factory steps.
- Trigger.dev
Background jobs for TypeScript apps, including long agent runs.
- Vercel AI SDK
TypeScript SDK for streaming model UIs and tool-calling apps.
- Warp
Open terminal, multi-model agents, and factories in early access.
- Zed
Open Rust editor with first-class agent panels.