AI Developer Tools

Letta

freemium

Letta provides an agent harness, applications, and developer interfaces for building stateful agents whose memory, identity, tools, and conversations persist over time.

LangGraph

free

LangGraph is a low-level framework and runtime for building stateful agents with durable execution, streaming, persistence, and human-in-the-loop control.

LangSmith

freemium

LangSmith helps teams trace, monitor, evaluate, and improve LLM applications and agents across development and production.

Arize AI

freemium

Arize AX captures application traces, surfaces recurring issues, runs configurable evaluations, and compares experiments so AI teams can diagnose and improve agents and other production AI systems.

Langfuse

freemium

Langfuse helps teams trace AI application behavior, evaluate outputs, manage prompts, and compare quality, cost, and latency across development and production.

Braintrust

freemium

Braintrust is an AI evaluation and observability platform for tracing applications, testing changes, scoring production traffic, and turning real interactions into better datasets.

LlamaIndex

freemium

LlamaIndex provides an open-source framework plus managed parsing, extraction, indexing, and agent workflow services for applications that work with private data.

DSPy

free

DSPy is an open-source Python framework for composing language-model programs from signatures and modules, then optimizing prompts and examples against developer-defined metrics.

Zep

freemium

Zep is managed memory infrastructure that builds temporal context graphs from conversations and business data, then retrieves relevant context for AI agents.

Mem0

freemium

Mem0 provides hosted and open-source memory infrastructure that stores, updates, and retrieves user, session, and agent context across interactions through APIs and framework integrations.

Exa

usage based

Exa provides APIs for web search, page contents, structured deep research, monitoring, and agent workflows, with latency and output controls designed for model and agent applications.

Chroma

usage based

Chroma stores documents, embeddings, and metadata and supports dense, sparse, hybrid, full-text, regex, metadata, and multimodal retrieval through an Apache-2.0 project and serverless cloud service.

Qdrant

freemium

Qdrant is a Rust-based vector search engine and managed platform for dense, sparse, hybrid, filtered, multivector, and reranked retrieval across cloud, hybrid, private, and self-hosted deployments.

Milvus

free

Milvus is an Apache-2.0 vector database for storing vectors and related scalar data, running approximate nearest-neighbor search, and scaling from an embedded local library to standalone or distributed deployments.

Weaviate

freemium

Weaviate stores data objects and vector embeddings for semantic and hybrid search, retrieval-augmented generation, and agent workflows, with open-source self-hosting and managed cloud plans.

LM Studio

freemium

LM Studio runs compatible open models on macOS, Windows, and Linux, provides chat and document workflows, exposes local APIs and SDKs, and adds the Bionic agent with optional paid cloud inference.

Together AI

usage based

Together AI provides serverless and dedicated inference, batch processing, fine-tuning, GPU clusters, sandboxes, and model deployment tools for open and custom AI workloads.

GroqCloud

usage based

GroqCloud provides OpenAI-compatible APIs for running supported text, vision, and speech models with service tiers for interactive, burst, and batch workloads.

Infield

free

Infield is an AI-driven platform that automates the process of upgrading open source software dependencies, helping engineering teams maintain up-to-date applications securely and efficiently.

Retell AI

usage based

Retell AI provides no-code and developer tools for building, testing, deploying, and monitoring voice and chat agents with telephony, knowledge, integrations, and call analytics.

Qodex

freemium

Qodex reviews pull requests and runs API, browser, and security scenarios against preview or staging environments, returning reproducible findings with requests, responses, and screenshots.

Xpander.ai

free

Xpander.ai offers an AI Agent Builder platform that simplifies the creation of production-grade AI agents capable of executing complex, multi-step tasks across various systems. Its innovative Agent Graph System and Agentic Interfaces enable seamless integration and reliable task execution, reducing development time and enhancing agent performance.

Daizy

free

Daizy provides AI agents designed to enhance marketing, sales, and research efforts within financial services, automating tasks such as content generation and client engagement to increase productivity.

GOAT SDK

free

GOAT SDK is an MIT-licensed TypeScript and Python toolkit with wallet adapters, agent-framework adapters, and plugins for payments, tokens, markets, data, and other onchain actions.