Add emacs and more tools to /tools/; fix a typo

src/site/tools/index.html

 ---
 layout: default
 title: "Tools for Dart"
 description: "Lots of tools to help you write your Dart apps."
 has-permalinks: false
 js:
 - url: /js/os-switcher.js
   defer: true
 - url: /js/editor-downloads-analytics.js
   defer: true
@@ skipping 11 matching lines @@
     </div>
     <div class="span6">
       <img src="images/dart-editor.png"
            style="border:1px gray solid">
     </div>
   </div>
 </div>
 
 
 <p>
-  The Dart download has 
+  The Dart download 
   has everything you need
   to edit, run, and debug Dart apps.
 </p>
 
 <div align="center">
   {% include downloads/_dart-editor.html %}
 </div>
 
 <div class="row">
   <div class="span4">
@@ skipping 17 matching lines @@
       Alternatively, you can use Dart plugins for other editors and IDEs:
     </p>
 
     <table>
       <tr>
         <td> <img src="images/eclipse.png" align="left" width="48"
                   alt="Eclipse logo" > </td>
         <td> <a href="/tools/eclipse-plugin/"><b>Eclipse</b></a> </td>
       </tr>
       <tr>
+        <td> <img src="images/emacs.png" width="48"
+                  alt="Emacs logo" > </td>
+        <td> <a href="https://github.com/nex3/dart-mode"><b>Emacs</b></a> </td>
+      </tr>
+      <tr>
         <td> <img src="images/IntellIJ-IDEA.png" width="48"
                   alt="IntelliJ logo" > </td>
         <td> <a href="http://plugins.intellij.net/plugin/?idea&amp;id=6351"><b>IntelliJ IDEA and WebStorm</b></a> </td>
       </tr>
       <tr>
         <td> <img src="images/sublime.png" width="48"
                   alt="Sublime logo" > </td>
         <td> <a href="https://github.com/dart-lang/dart-sublime-bundle#readme"><b>Sublime Text 2</b></a> </td>
       </tr>
       <tr>
@@ skipping 57 matching lines @@
         <dd> Dart tools generate some files
           that should be local only.
           Here's some advice on what <em>not</em> to put
           into your source repository. </dd>
       <dt> <a href="/docs/dart-up-and-running/contents/ch04-tools-dart2js.html#tools-dart2js-debugging">Debugging code produced by dart2js</a> </dt>
         <dd> Dart web apps are easiest to debug
           with Dart Editor and Dartium.
           So how do you debug the app
           once it's been compiled to JavaScript?
           Here are a few tips for specific browsers. </dd>
-    </ul>
+      <dt> More tools</dt>
+        <dd> This site relies on two non-SDK tools
+          to test and deploy Dart code:
+          <ul>
+            <li> <a href="https://drone.io">drone.io</a>
+              continuous integration </li>
+            <li> <a href="http://pub.dartlang.org/packages/hop">HOP</a>
+              task framework </li>
+          </ul>
+
+          You might want to try these, as well:
+
+          <ul>
+            <li> <a href="http://pub.dartlang.org/packages/bot">BOT</a>,
+              the Dart bag-of-tricks</li>
+            <li> <a href="https://github.com/igrigorik/heroku-buildpack-dart">Heroku buildpack for Dart</a>,
+              which lets you run your server-side Dart app
+              on Heroku's cloud</li>
+          </ul>
+        </dd>
+    </dl>
   </div>
 </div>
 
 <p>
   Dart Editor, Dartium, and the SDK tools
   work in recent versions of
   {% include os-choices.html %}
 </p>
 
 <aside class="alert alert-info">
   <b>Note:</b> The Dart development tools <b>do not support Windows XP</b>.
 </aside>