I like how it's open sourced so you can run your own copies of both server side software (like PHP) as well as client side HTML/CSS etc all from one place! It doesn't support CSS3 or JavaScript yet but its growing quickly! So far nothing major to dislike about this program though - just minor things such as having some bugs come up now and then :) If running multiple sites using different CMSs / frameworks at once there may be something else available for use which does what NPP offers better however if price isn’t an issue than i highly recommend trying out their trial version first before purchasing anything ;) They have free trials for most products they offer too!