Captivate is software for recording audio and video of a user's screen. Users can import PowerPoint slides and add rich media, simulations, and quizzes, and publish them to learning management systems that support the SCORM standard.
iSpring is an authoring tool that allows you to create online presentations with slides synced with audio and video narration. You can create quizzes and courses, add attachments and web links, and integrate these courses with BlackBoard LMS. Additionally, you can download iSpring Free which allows you to convert PowerPoint to Flash for free to view your presentations online.
Web-based web discussion tool (it's not a full fledged learning management system) that allows student to ask questions and interact with teachers in a public space, which, ideally, saves time for teachers and fosters greater engagement.