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Best AI Tools for Ai development and operations (29 options)
29 tools for AI development and operations in the directory. Observability, evaluation, data and fine-tuning tools for AI applications.
How to read this page. We do not rank tools or publish scores. This page lists every AI Developer Tools tool in the directory with its official link and pricing model so you can shortlist, then try the ones that fit. Pricing labels come from each vendor's pricing page when we could confirm them; "See site" means we could not.
At a glance
- 29 tools listed; 11 free to use, 5 with a free tier, 0 paid, 13 where pricing is not confirmed here.
- With a free plan or tier: Axolotl, Braintrust, Docling, Firecrawl, Gradio, Helicone, Instructor, Langfuse, llama.cpp, MLflow, Outlines, Ragas, Ray, Roboflow, Streamlit, vLLM.
What to look for
Check language and framework support, self-hosting options and how the tool fits your existing deployment and monitoring stack.
All 29 tools
| Tool | What it does | Pricing | Link |
|---|---|---|---|
| Arize Phoenix | Open-source observability and evaluation tool for LLM apps. | See site | Official site |
| Axolotl | Open-source tool for fine-tuning language models. | Free | Official site |
| Braintrust | Evaluation and observability platform for AI products. | Freemium | Official site |
| Docling | Open-source toolkit for converting documents into structured formats for AI. | Free | Official site |
| E2B | Secure cloud sandboxes for running code produced by AI agents. | See site | Official site |
| Firecrawl | API that crawls websites and returns clean, LLM-ready data. | Freemium | Official site |
| Gradio | Python library for building and sharing web demos of machine learning models. | Free | Official site |
| Guardrails AI | Framework for validating and guarding LLM outputs. | See site | Official site |
| Helicone | Open-source LLM observability and gateway platform. | Freemium | Official site |
| Instructor | Library for getting structured outputs from language models. | Free | Official site |
| Jina AI | Embeddings, reranker and web reader models and APIs for search. | See site | Official site |
| Label Studio | Open-source data labeling tool for many data types. | See site | Official site |
| Lakera | Security platform for protecting generative AI applications. | See site | Official site |
| Langfuse | Open-source LLM engineering platform for tracing, evaluation and prompt management. | Freemium | Official site |
| LangSmith | Observability, evaluation and deployment platform for LLM applications. | See site | Official site |
| llama.cpp | Open-source C/C++ library for running language models efficiently on local hardware. | Free | Official site |
| MLflow | Open-source platform for managing the machine learning and GenAI lifecycle. | Free | Official site |
| Opik | Open-source platform from Comet for evaluating and monitoring LLM applications. | See site | Official site |
| Outlines | Library for constraining language model output to defined structures. | Free | Official site |
| Promptfoo | Open-source tool for testing and red-teaming prompts, models and agents. | See site | Official site |
| Ragas | Open-source toolkit for evaluating retrieval-augmented generation applications. | Free | Official site |
| Ray | Open-source framework for scaling Python and AI workloads. | Free | Official site |
| Roboflow | Computer vision platform for labeling, training and deploying models. | Freemium | Official site |
| Streamlit | Python framework for building data and AI web apps. | Free | Official site |
| Unsloth | Open-source library for faster, lower-memory fine-tuning of language models. | See site | Official site |
| Unstructured | Turns documents into structured data for LLM pipelines. | See site | Official site |
| vLLM | Open-source high-throughput inference engine for large language models. | Free | Official site |
| Voyage AI | Embedding and reranking models for retrieval. | See site | Official site |
| Weave | Weights & Biases toolkit for tracking and evaluating LLM applications. | See site | Official site |