AI (Artificial Intelligence) technology is constantly evolving and improving、There are many free AI resources available online, including:

1、TensorFlow: An opensource machine learning framework developed by Google.

2、PyTorch: An opensource machine learning library developed by Facebook.

3、Keras: A highlevel neural networks API, written in Python and capable of running on top of TensorFlow, CNTK, or Theano.

4、Scikitlearn: A simple and efficient tool for data mining and data analysis、It is built on NumPy, SciPy, and matplotlib.

5、OpenCV: An opensource computer vision and machine learning software library.

6、NLTK (Natural Language Toolkit): A leading platform for building Python programs to work with human language data.

7、Gensim: A Python library for topic modeling and document similarity.

8、spaCy: An industrialstrength Natural Language Processing (NLP) toolkit.

9、Hugging Face's Transformers: A library providing stateoftheart pretrained models for NLP tasks such as classification, information extraction, question answering, etc.

10、Fast.ai: A deep learning library that provides practitioners with components they need to quickly and easily build productionready applications.

These tools can help you get started with AI without any cost.