D&D Character Builder (Classic Edition) (2008)

From the Character Builder webpage:

Making characters has never been easier -- or more enjoyable. D&D Insider subscribers can create characters from levels 1 to 30. Start rolling up characters. Level 'em up. Try different builds. Explore every option and possibility you can think of -- from paragon paths to epic destinies and everything in between.

Note: This entry is for the older (2009 and earlier) Classic Edition of the Character Builder which was downloaded and run off-line. The new (2010 and newer) edition is online only and driven by Silverlight. You can find the new entry at D&D Character Builder (Online Edition).