Zaption - Interact & Learn with Video Lessons
Add questions to videos so you can make them interactive and check for understanding or encourage reflection
eFront: Top 10 Open Source e-Learning Projects to Watch for 2011
Great collection of open source e-learning projects and tools, including multimedia development, screen recording, Android app development, an LMS, and more. (Technically, some of these are Free, not Open Source, but still a valuable list.)
CourseLab - free e-Learning authoring tool
Free tool for course authoring. Screen captures and PowerPoint imports are paid extras, but the basic tool is free. Might be nice for creating portfolio samples if you don't have access to Captivate or Articulate.