Open edX

Pros: Open edX comes with a built-in authoring tool called Studio which offers by default a wide range of different component types. This allows course creators and educators to build diversified, engaging and interactive courses. It is easy to use both from the learner's (LMS) and the educator's (Studio) point of view.
In case the default available component types do not cover the respective requirements, the platform can be easily extended (among others via LTI). Open edX is a great and modern platform to transfer and query knowledge.

Cons: A product that lives through the active exchange and work of a worldwide community of experienced frontend and backend developers should also provide features by standard that enable the work as a learning community. This aspect is still expandable.

Overall: Concluding, Open edX is a great product, which is especially characterized by its user-friendliness, the simple but effective learner guidance and the different functionalities and options.
It is extendable and customizable in a high level. The platform can be seamlessly integrated into an existing infrastructure.

Pros: The Open edX software is open source, which ensures a modern architecture with short release cycles and continuous technological advancements. This creates the potential for more flexibility and faster innovation.

Open edX is characterized by its high level of flexibility and scalability, so the platform can be adapted according to requirements and the number of concurrent users.

The platform consists in the front end out of two parts: the LMS and the Course Management System (“Studio”).

Cons: A modular, but very large and complex ecosystem. The learning curve for developers can be difficult.

Overall: The benefit of Open Edx based on open standards, external applications and information can be easily integrated. The use of open standards enables institutions, organisations and companies to select many use cases and expand them as required. With Open edX you can offer diversified learning models.

Pros: The open edX platform is a complete open source solution for building and running online courses. It is the platform that powers the edx.org website where millions of learners worldwide find thousands of great courses.
The functionalities in the platform are broad and well designed and there is a lot of flexibility for authors to build high quality learning experiences.

Cons: Setting up, configuring and operating the platform is challenging, but there is a live community of users willing to help and also well stablished companies that provide professional services to organizations interested in using this technology.

Overall: I've been working with the platform for 7+ years in many different projects, spanning from small online academies to large government projects.
Overall, the Open edX platform is a great tool for robust, large scale and long term online learning projects.

Pros: Massive catalog of courses.
Lots of recognized institute-curated content.
Experienced teachers.
Great community and forums.
Free tracks of most courses.
Certificates can be gained by one time payment for individual courses.

Cons: No cons it is hands down the best platform for technical courses.

Overall: edX is the best platform for learning technical skills be it basic programming or artificial intelligence. A lot of reputed institutes provides their online courses with degree and certifications via edX , best part is you can do most of these courses for free and only need to pay for the degree or certificate if you want that.

Pros: Wide range of topics
Good quality of course content and instructors
Most courses are offered for free
Certifications from recognized universities
Professional programs in tie-up with unis
Courses are archived once complete - allows for access even after completion
Financial assistance program

Cons: The only con i found is that it can be challenging for a new user to navigate and understand everything edX has to offer - there are multiple types of courses and tracks and it takes some time to get used to.

Overall: edX is an excellent massive open online course platform and I highly recommend edX for anyone looking for e-learning programs. Most of the programs are for free; only certification is charged.

Pros: There are more than 2000 online course available. Very easy to understand course and easy to clear doubt. It has lots of quizzes and exams to test you skills.

Cons: To get certificates you need to buy complete programs.

Overall: Overall Edx is very trusted online learning app. I loved It's concept to get access of study material for no cost. The courses are very well taught and easy to understand. If you want to extend your education this is best platform to learn in free time.