- ABA English: a unified English course. The free version gives access to courses but not speaking and writing activities or interaction with teachers. https://www.abaenglish.com/en/prices/
- Alison: multiple different online English courses in various areas. https://alison.com/courses/language
- American English: Sponsored by the US State department. Not many course, but geared for passing standardized English exams and obtaining real-world skills. https://www.openenglishprograms.org/MOOC
- BBC Learning English: many English topics. https://www.bbc.co.uk/learningenglish/
- Canvas: various free English courses. https://www.canvas.net/
- Class Central (Udacity): various English courses, some free. https://www.classcentral.com/provider/udacity
- Coursera: a huge number of courses, some free. https://www.coursera.org/search?query=english&
- ESOL: free, at multiple levels. https://www.esolcourses.com/
- Massively Open Online English Course: provide various English courses on different topics. https://mooec.com/courses
- Future Learn: various online courses that promote communicating with others taking the courses. https://www.futurelearn.com/
- My MOOC: many different courses, some for free. https://www.my-mooc.com/en/
- Oxford Online English: free English lessons. https://www.oxfordonlineenglish.com/free-english-lessons
- Perfectly Spoken: 10 hours of content free per month. https://perfectlyspoken.com/
- Saylor: free courses, often with free completion certificate. https://learn.saylor.org/course/search.php?areaids=core_course-course&q=English
- USA Hello: you can choose from General English or Business English course tracks. One year membership is free. https://www.bbc.co.uk/learningenglish/
- USA Learns: has free beginning and intermediate English courses, including a primer for the naturalization interview. https://www.usalearns.org/free-online-english-courses