Sakai

Sakai is an open-source LMS governed by Apereo Foundation, a nonprofit organization that stewards educational technology. You can download and install it on your own servers, review the source code, customize every module, and contribute improvements back to the community. It supports 20+ languages out of the box and includes built-in chat, wikis, forums, and document sharing for collaborative learning.

Sakai appeals to universities and institutions seeking transparency, data ownership, and the flexibility to modify the platform to fit their needs without vendor lock-in. It requires technical resources to host and maintain, so it's best for organizations with IT teams or the budget to hire support; in return you get full control and a cost model that doesn't scale with enrollment.