Starting from this link here are some learning management related sites.

If you USE one of these, increment the Used By: count and create a wiki page to discuss that LMS as a topic.

Moodle
Course Management System (CMS), Learning Management System (LMS) or Virtual Learning Environment (VLE)
http://moodle.org/
Used by: 1

eFront
specialized commercial editions for Small companies, Educational institutes and Enterprises
http://www.efrontlearning.net/
Used by: 0

Dokeos
course management features plus flash based videoconferencing
http://www.dokeos.com/
Used by: 0

Claroline
Open Source eLearning and eWorking platform (35 languages)
http://www.claroline.net/
Used by: 0

Sakai Project
learning management system, research collaboration system and ePortfolio solution
http://www.sakaiproject.org/
Used by: 0

Olat
OLAT (Online Learning And Training), web-based Learning Management System
http://www.olat.org/
Used by: 0

WizIQ
Teachers can teach live, create quizzes, upload powerpoints and import all these into the live class.
http://www.wiziq.com
Used by: 0

aTutor
Multiple translations, quick to install, SCORM, etc.
http://www.atutor.ca
Used by: 0

ILIAS
flexible and powerful open source learning management system
http://www.ilias.de/docu/
Used by: 0

.LRN
enterprise-class open source software for supporting e-learning and digital communities
http://dotlrn.org/

Used by: 0

eOrg
open source elearning PHP project (English/Turkish)
http://code.google.com/p/eogr/
Used by: 0