🚀 2026 AI Infrastructure Directory

Architect your next AI Agent Stack.

Evidenced-based comparisons, real-time pricing benchmarks, and self-hosting matrices for enterprise LLM applications.

Orchestration & Frameworks Freemium / Open Source

LangChain

Build context-aware, reasoning applications with composable components.

Chains & Agents VectorStore Integrations LangSmith Observability
Starts at $0 (LangSmith from $39/mo)
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Data Frameworks & RAG Freemium / Open Source

LlamaIndex

The leading data framework for building LLM applications and enterprise RAG.

Advanced RAG pipelines Document Parsing (LlamaParse) Evaluation & Observability
Starts at $0 (LlamaCloud from $50/mo)
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Multi-Agent Systems Freemium / Open Source

CrewAI

Cutting-edge framework for orchestrating role-playing, autonomous AI agents.

Role-based agent design Autonomous task delegation Sequential & Hierarchical execution
Starts at $0 (CrewAI Enterprise Custom)
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Multi-Agent Systems Open Source

AutoGen (Microsoft)

Enable next-gen LLM applications with multi-agent conversation frameworks.

Multi-agent conversations Human-in-the-loop workflows Code execution in Docker
Starts at $0
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Vector Databases Usage-based

Pinecone

Managed, cloud-native vector database designed for fast vector search and RAG.

Serverless vector search Real-time index updates Enterprise-grade security (SOC2)
Starts at Free tier available (Serverless from $0.04/M queries)
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Vector Databases Freemium / Open Source

Weaviate

Open-source AI-native vector database with hybrid search and modular machine learning models.

Hybrid Search (Vector + BM25) GraphQL & REST API Built-in vectorizers
Starts at $0 (Cloud from $25/mo)
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Vector Databases Freemium / Open Source

Qdrant

High-performance vector similarity search engine and vector database written in Rust.

Rust-native engine Payload-based filtering Quantization (scalar & binary)
Starts at $0 (Cloud from $25/mo)
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Orchestration & Frameworks Open Source

DSPy (Stanford)

Framework for programmatically optimizing LM prompts and weights instead of manual prompting.

Automatic Prompt Optimization Compiler for LM pipelines Assertion & Metric evaluation
Starts at $0
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Observability & Monitoring Freemium

LangSmith

The unified DevOps platform for debugging, testing, evaluating, and monitoring LLM apps.

Full Execution Tracing Automated Dataset Evaluation Latency & Cost Analytics
Starts at $0 (Plus at $39/mo/seat)
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Observability & Monitoring Open Source / Cloud

Langfuse

Open source LLM engineering platform: observability, metrics, evals, prompt management.

Open-Source Tracing Prompt Version Control Cost & Token Tracking
Starts at $0 (Cloud Free Tier / Pro from $59/mo)
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API Proxy & Gateways Open Source / Enterprise

LiteLLM

Call 100+ LLMs using the OpenAI input/output format with unified key management & load balancing.

Unified 100+ LLM API Load Balancing & Fallbacks Spend Tracking & Virtual Keys
Starts at $0 (Enterprise proxy custom)
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Model Serving & Inference Open Source

vLLM

High-throughput and memory-efficient inference and serving engine for LLMs with PagedAttention.

PagedAttention Algorithm Continuous Batching OpenAI-compatible server
Starts at $0
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