Are there any opensource .Net libraries that handle Flesch-Kincaid readability calculations?
Wiki: http://en.wikipedia.org/wiki/Flesch-Kincaid_readability_test
Not open source, but you could delegate to Word using the ReadabilityStatistic interface. Even if your document isn't in Word to begin with, you could open Word (invisibly to the user), dump your text into Word, and then use ReadabilityStatistic
to calculate the statistics.