1. .net 1.0, asp.net 1.0 and IBuySpy Portal in 2001
  2. DotNetNuke in 2003 (named after PHP-Nuke)
  3. DotNetNuke v4 & DotNetNuke Corp. 2006
  4. Venture Capital 2008+ and release of Evoq (paid version of DNN)
  5. Social Distancing: Between 2010 and 2017 DNN Corp basically cut of the community from decision making and took over everything, but didn't want to improve DNN too much so they could sell Evoq. This strategy was bad for the market.
  6. DNN Corp purchased by ESW Capital in 2017
  7. After the purchase ESWs focus is making money hosting Evoq and DNN, and gave back full control to the community. The IP was handed over to the .net foundation. 

More details about this in Wikipedia.