a logical inference engine
this page is for entering a script of assertions and questions and having the questions automatically answered from the assertions. It doesn't think for you or understand English but it can prove that your conclusions follow from your premises and show, mercilessly, how you got from one to the other.
well, why not. There are many situations where provably sound and complete inference is a good thing: project proposals, essay plans, contract wordings, logic puzzles, general arguing with your mates down the pub.
if you sign-up with your email address you can name and save some scripts, your width, height & work areas are saved when you logout, and you get an email whenever the page changes. It's free to use but you can pay not to see the ads or to save more scripts.