Here is the list of 11 Oper Source LMS with a brief description. I highly encourage you to visit each LMS site and explore its capabilities pros and cons.
eFront Easily extended with modules available from the site.
ATutor Offers tools for management of learning.
Sakai Aimed at Universities was created by the Sakai Foundation.
Docebo Compatible with SCORM 1.2. Two cool tools that it offers is video conferencing and HR systems like SAP and Oracle
Dokeos Supports converting Office documents into Flash and user synchronization with Oracle and SAP.
ILIAS It offers collaboration tools such as chat and forums, and distribution technologies like RSS and podcasts.
Ganesha This LMS developed in French but it can be translated.
.LRN Developed at MIT.
Do not forget to follow Moodlers Online on Twitter!!!Links that I recommend!