Some of the URLs to look at...

10 operating systems you've never heard of :
http://www.techradar.com/news/software/operating-systems/10-operating-systems-you-ve-never-heard-of-657469?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+Socialblade-DiggFrontpageData+%28SocialBlade+-+Digg+FrontPage+Data%29&artc_pg=1

Top 10 Innovations:
http://www.the-scientist.com/article/display/56171/