Do you answer too many questions on stack sites? Does answering questions put you into a cycle of debating with people you'd rather not be spending time on? Then this app is for you.
It does one thing, but it does it well: it hides the Answer form on Question pages, making it difficult but not impossible to answer questions.
For more on why I wrote it, see How to not get reputation points on Stack Overflow.
The script is a simple Greasemonkey script: no_so_answers.user.js
// ==UserScript==
// @name No answering on Stackoverflow
// @namespace http://nedbatchelder.com/greasemonkey
// @description Hide the answer box on Stack Overflow
// to stop obsessive behavior
// @include http://stackoverflow.com/*
// ==/UserScript==
GM_addStyle(
"@namespace url(http://www.w3.org/1999/xhtml); " +
".question-page #post-form { display: none; }"
);