open source
Open Source: Free as in "Free"
Here's Scott Hanselman [http://www.hanselman.com/blog/SandcastleMicrosoftCTPOfAHelpCHMFileGeneratorOnTheTailsOfTheDeathOfNDoc.aspx] on the death of nDoc [http://www.charliedigital.com/PermaLink,guid,95b2ab68-ba92-413a-b758-2783cde5df9c.aspx] : > We are blessed. This Open Source stuff is free. But it's free like a puppy. It takes years of care and feeding.