✓
Tool
Category
Pricing
Free?
Updated
Portkey AI
AI Agents
Freemium
✓
Mar 2026
→
AI gateway providing unified LLM access with reliability features and observability
Best for: AI-gateway
Langfuse
AI Agents
Freemium
✓
Mar 2026
→
Open-source LLM observability platform for tracing, debugging, and monitoring AI agents
Best for: observability
Helicone
AI Agents
Freemium
✓
Mar 2026
→
Open-source LLM proxy for logging, monitoring, and analyzing all AI API calls
Best for: LLM-proxy
PromptLayer
AI Agents
Freemium
✓
Mar 2026
→
Prompt management platform with logging and analytics for LLM API calls
Best for: prompt-management
DSPy
AI Agents
Free
✓
Mar 2026
→
Stanford framework for algorithmically optimizing LLM prompts and agent pipelines
Best for: DSPy
LlamaIndex ✓
AI Agents
Freemium
✓
Mar 2026
→
Framework for building production RAG systems and data-connected AI agents
Best for: rag
Stagehand
AI Agents
Free
✓
Mar 2026
→
AI-native browser automation framework using LLMs to interact with web pages
Best for: browser-automation
Humanloop
AI Agents
Freemium
✓
Mar 2026
→
Collaborative platform for prompt management, evaluation, and LLM fine-tuning
Best for: prompt-management
LangSmith
AI Agents
Freemium
✓
Mar 2026
→
Developer platform for debugging and monitoring LangChain-based AI agent applications
Best for: LangChain
Arize Phoenix
AI Agents
Freemium
✓
Mar 2026
→
Open-source AI observability tool with interactive tracing and RAG evaluation
Best for: observability
Weights & Biases Weave
AI Agents
Freemium
✓
Mar 2026
→
W&B toolkit for tracing, evaluating, and improving AI agent applications
Best for: W&B
Smolagents
AI Agents
Free
✓
Mar 2026
→
Lightweight Hugging Face agent framework where LLMs write code to use tools
Best for: Hugging Face