What are some alternatives?
When comparing SWAD and Edmodo LMS, 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.
Open edX - Open edX is implemented mostly in Python (with some Ruby and NodeJS as well) and the code is being...
edx-platform - The edx-platform is the main repository of edX Code covering both the LMS and the authoring tool...
Fedena - Fedena is a multipurpose college and school management software, it is used by 40K+ education institutions worldwide to automate administration & academic-related activities.
Lectrio - Lectrio is the next-generation online learning environment.