I just looked over the "Top 50 Open Source Companies Ranked by Momentum Index" posted at http://momentumindex.com/50-open-source-momentum-index/ These are businesses built on top of open source technologies. The list of successful companies is growing and investors have been pouring money into them.
The following are selected mid-size open source companies to watch and possibly invest in as they grow and go public over time. Many of these were simply open source projects just 5 years ago. They're now thriving startup companies that continue to innovate, expand, and position themselves to become some of the top companies in the future as we move further into the 21st century 'Information Age' where collaboration, open solutions, and innovation (COSI) are king.
Company & Website
What other companies do you think ought to be added to the list? Companies in the 'Open' Education space?