Tools for builders
A curated index of 20 frameworks, runtimes, and infrastructure pieces. Organized by stack layer. Independently selected — no paid placement.
Models
Frameworks
Orchestration
AutoGen
Microsoft Research
Conversational multi-agent framework with strong reasoning patterns.
CrewAI
CrewAI
Role-based multi-agent framework with declarative crew definitions.
Inngest Agent Kit
Inngest
Durable workflows and step functions for agents.
LangGraph
LangChain
Stateful, graph-based orchestration for LLM workflows with deterministic checkpoints.
Temporal
Temporal
Durable workflow engine increasingly used for long-running agents.
Memory
Tool use
Sandboxes
Observability
Arize Phoenix
Arize AI
OpenTelemetry-native LLM observability and evaluation.
Helicone
Helicone
Lightweight LLM observability with a proxy-first model.
Langfuse
Langfuse
Open-source observability for LLM and agent applications.
Weights & Biases Weave
Weights & Biases
Tracing, evals, and experiment tracking unified.