What are some alternatives?
When comparing SWAD and edx-platform, you can also consider the following products
Moodle - Moodle - Open-source learning platform | Moodle.org
Chamilo - Chamilo is a software that allows you to create a virtual campus for the provision of online or semi-online training.
Edmodo LMS - Edmodo is an easy way to get your students connected so they can safely collaborate, get and stay organized, and access assignments, grades, and school messages.
Khan Academy - Khan Academy offers online tools to help students learn about a variety of important school subjects. Tools include videos, practice exercises, and materials for instructors. Read more about Khan Academy.
Open edX - Open edX is implemented mostly in Python (with some Ruby and NodeJS as well) and the code is being...
Fedena - Fedena is a multipurpose school management software & school information management system used by education institutions worldwide for administration & academic-related activities.