1.Machine Learning by Stanford University (Coursera) –This course is taught by Andrew Ng, a pioneer in the field, and covers a broad range of foundational machine learning topics.

2.Deep Learning Specialization (Coursera)– Also taught by Andrew Ng, this deep learning specialization is a series of four courses that help students understand the capabilities, challenges, and consequences of deep learning.

3.Machine Learning Crash Course (Google)– Google’s fast-paced, practical introduction to machine learning features video lectures with Google researchers, real-world case studies, and hands-on practice exercises.

4.Introduction to Machine Learning for Coders (fast.ai)–Taught by Jeremy Howard, this course dives deep into machine learning from a coding perspective and utilizes the fast.ai library.

5.Machine Learning with Python (Coursera) –This course focuses specifically on using Python for machine learning with a practical approach that includes numerous projects and exercises.

6.Data Science and Machine Learning Bootcamp with R and Python (Udemy)– This free Udemy bootcamp offers knowledge on how to use both R and Python for data science and machine learning.

7.AI For Everyone by Andrew Ng (Coursera) –While not exclusively a machine learning course, this program demystifies AI technology for non-engineers who want to understand its implications and uses in business.

8.Practical Deep Learning for Coders (fast.ai) –Another offering from fast.ai that focuses specifically on deep learning, teaching students how to train and deploy models using the latest tools.

9.Intro to TensorFlow for Deep Learning (Udacity) –An introductory course on using Google’s TensorFlow framework for creating neural networks and various AI models.

10.Applied Data Science with Python Specialization (Coursera) –Not exclusively on machine learning but includes it as part of the wider curriculum on data analysis, visualization, and application of statistical techniques.

11.Microsoft Professional Program in Artificial Intelligence (edX) –A comprehensive program covering AI concepts including machine learning provided by industry leader Microsoft through edX platform.

12.Learning from Data (Caltech) –A more theoretical course which delves into the fundamental aspects of machine learning algorithms and theory, led by professor Yaser S. Abu-Mostafa.

These free online courses offer a convenient way to jumpstart your knowledge or further advance your skills in the exciting field of machine learning. Whether you’re new to the field or looking to specialize further, there’s an abundance of resources available at no cost that can help you stay on top of this rapidly evolving discipline.