Udemy: Udemy is a platform where instructors can create courses that can be purchased by members of the Udemy community. Udemy is primarily focused on students looking for courses and the platform has a very wide range of courses. Anyone can create and sell courses on Udemy, which means that the quality and prices of courses can vary greatly. It is one of the most popular online course platforms where users can learn tangible skills such as programming, digital marketing or a foreign language (udemy.com).

Coursera: This online course platform has one of the largest number of courses on offer, with more than 4000 courses offered in partnership with universities and companies. The courses it offers can be accredited (coursera.org).

edX: Like Coursera, edX works with the world's top universities to offer students high-quality courses. Courses are typically free, but they also offer the opportunity to obtain accredited certificates (edx.org).

Skillshare: Skillshare is an opportunity for people who want to learn creative skills. The presenters are experienced in these areas and the courses are presented in short and easy-to-follow videos (skillshare.com).

Teachable: the course platform allows trainers to create and sell their own courses. However, Teachable offers several features, including payment processing, customization of sales pages, email marketing integration and a social platform for instructors to interact (teachable.com).

Thinkific: Like Teachable, Thinkific is a platform that allows users to create and sell their own courses. Instructors can choose from a variety of course types, such as video, audio files, presentations or images. Thinkific is primarily focused on trainers looking for a simple and easy-to-use platform to create and sell courses. Thinkific offers flexible pricing and has several features for course customisation and marketing (thinkific.com).