Agent Framework
LangChain
Free (OSS)Most-used LLM application framework
LlamaIndex
Free (OSS)Data framework for LLM applications
CrewAI
Free (OSS) / enterprise availableMulti-agent orchestration framework
AutoGen
Free (OSS)Microsoft's multi-agent conversation framework
DSPy
Free (OSS)Programming LLMs instead of prompting
Agentic IDE
Claude Code
Included with Claude Pro/MaxAnthropic's CLI agentic coder
Cursor
Free → $20/mo ProVS Code fork with AI baked in
Windsurf
Free → $15/moCodeium's agentic IDE
Cline
Free (OSS, you pay API costs)Open-source agentic VS Code extension
aider
Free (OSS, you pay API costs)Terminal AI pair programmer
GitHub Copilot
$10/mo individual / $19/mo businessGitHub's AI pair programmer
Data Processing
Unstructured.io
Free OSS / $499+/mo cloudDocument ingestion for LLMs
LlamaParse
Free 1k pages/day → paidLLM-native document parsing
Firecrawl
Free tier → $19+/moWeb crawler for LLM training data
Embeddings
OpenAI text-embedding-3
$0.02-$0.13 per M tokensOpenAI's embedding models
Cohere Embed
$0.10 per M tokensEnterprise embedding with compression
Voyage AI
$0.02-$0.12 per M tokensTop-ranked embedding models
BGE (BAAI)
Free (self-hosted)Free open-source embeddings
Evaluation
Ragas
Free (OSS)Open-source RAG evaluation
DeepEval
Free (OSS)Unit-testing framework for LLMs
Promptfoo
Free (OSS)CLI for prompt testing and eval
Fine-tuning
Unsloth
Free (OSS)2x faster LLM fine-tuning
Axolotl
Free (OSS)Community fine-tuning framework
HuggingFace TRL
Free (OSS)Transformer RL library
Hosting
Modal
Pay-per-computeServerless GPU infrastructure
Replicate
Pay-per-second of computeRun open-source models via API
RunPod
From $0.20/hrGPU cloud for AI/ML
Baseten
PaidProduction ML inference platform
Image
Stable Diffusion
Free (OSS)Open-source text-to-image
Flux
Free (OSS) for SchnellBlack Forest Labs' best-in-class open image model
Midjourney
$10+/moDiscord-based AI image generation
LLM API
Claude API
$3/$15 per M tokens (Sonnet 4.6)Anthropic's frontier language model API
OpenAI API
$2.50/$10 per M tokens (GPT-5.4)GPT-5 family and tool ecosystem
Gemini API
$1.25/$5 per M tokens (Gemini 3.1 Pro)Google's multimodal frontier model
Mistral API
$0.25/$1.25 per M tokens (Large)European frontier models with open weights
Cohere API
$0.50/$1.50 per M tokens (Command-R+)Enterprise-focused LLM platform
Groq
$0.05/$0.08 per M tokens (Llama 3.1 70B)World's fastest LLM inference
Together AI
$0.18-$0.88 per M tokensOpen-model hosting and fine-tuning
Fireworks AI
$0.20-$0.90 per M tokensFast open-model inference with fine-tuning
LLM Utility
LiteLLM
Free (OSS)Unified interface for 100+ LLM APIs
OpenRouter
Free (passthrough pricing)Single API for all LLM providers
Instructor
Free (OSS)Structured outputs from LLMs
Outlines
Free (OSS)Guided generation for LLMs
Local Runtime
Ollama
Free (OSS)Run LLMs locally with one command
LM Studio
FreeDesktop app for local LLMs
vLLM
Free (OSS)Production-grade LLM inference server
llama.cpp
Free (OSS)C++ LLM inference on CPU and GPU
Observability
LangSmith
Free tier → $39/mo PlusLangChain's observability platform
Langfuse
Free self-host / cloud from $0Open-source LLM observability
Helicone
Free tier → paid at volumeLLM observability via proxy
Arize Phoenix
Free (OSS)Open-source ML observability
Braintrust
Free tier → paidEvaluation-first observability
Open Model
Llama
Free (open weights)Meta's open-weight LLM family
Gemma 4
Free (Apache 2.0)Google's Apache 2.0 open model family
Qwen
Free (Apache 2.0)Alibaba's most-downloaded open model family
DeepSeek
Free (open weights)Reasoning-specialized open models
GLM-5 (Zhipu AI)
Free (open weights)Beijing's open coding-frontier model
Platform
Protocol
Safety
Guardrails AI
Free (OSS)Validation layer for LLM outputs
NeMo Guardrails
Free (OSS)NVIDIA's dialogue safety framework
LLM Guard
Free (OSS)Security toolkit for LLM interactions
Search
Vector Database
Pinecone
Free tier → $70+/moManaged vector database for production RAG
Weaviate
Free self-hosted / managed from $25/moOpen-source vector DB with hybrid search
Chroma
Free (OSS)Dev-friendly embedded vector DB
Qdrant
Free self-hosted / managed cloudRust-based open vector database
Milvus
Free (OSS) / managed via ZillizDistributed vector DB for billion-scale
LanceDB
Free (OSS) / cloud comingServerless multimodal vector database
Video
Runway
Free tier → $15+/moAI video generation and editing
Sora
Included in ChatGPT Plus/ProOpenAI's text-to-video model
Voice
ElevenLabs
Free tier → $5+/moBest-in-class AI voice synthesis
Deepgram
Free credits → pay-as-goFast, accurate speech-to-text
Whisper
Free (OSS) or $0.006/min APIOpenAI's open-source speech-to-text