There's a great list of Confluence Objects Accessible From Velocity on the Atlassian Developers site. I often refer to that page. However, the list is not exactly complete.

Scott Dudley wrote a handy user macro that displays all the available objects. I've improved a little on Scott's user macro by linking to the latest Confluence JavaDocs for each class.

Here's the user macro:


## Based on Scott Dudley's answer here:
## http://stackoverflow.com/a/23819584/1958200
##
## @noparams
#set($cashMoney = "$") ## just for display
#set($macroUtilClass=$action.class.forName('com.atlassian.confluence.renderer.radeox.macros.MacroUtils'))
#set($getContextMethod=$macroUtilClass.getDeclaredMethod('defaultVelocityContext',null))
#set($ctx=$getContextMethod.invoke(null))
#set($objects = $ctx.keySet().toArray())</pre>
<ul>
<ul>#foreach($p in $objects)</ul>
</ul>
&nbsp;
<ul>
<ul>#set($className = $ctx.get($p).getClass().getName().toString())</ul>
</ul>
<ul>
<ul>
	<li><code>$cashMoney$p.toString()</code> –

 #if ($className.contains("$") == true || $className.startsWith("com.atlassian") == false)

 $className

 #else

 #set($classUrl = "https://docs.atlassian.com/com/atlassian/confluence/atlassian-confluence/latest/" + $className.replace(".", "/") + ".html")

 <a href="$classUrl">$className</a>

 #end</li>

</ul>

</ul>

&nbsp;

<ul id="velocityObjects">#end</ul>

<pre>

<script type="text/javascript">// <![CDATA[

  // Sort them - Confluence doesn't have velocity SortTool, so doing this client side.

  AJS.toInit(function ($) {

    var sort_by_name = function(a, b) {

      return a.innerHTML.toLowerCase().localeCompare(b.innerHTML.toLowerCase());

    }


    var velocityObjects = $("#velocityObjects > li").get();

    velocityObjects.sort(sort_by_name);

    for (var i = 0; i < velocityObjects.length; i++) {

      velocityObjects[i].parentNode.appendChild(velocityObjects[i]);

    }

  });

// ]]></script></pre>

<style><!--

  /* add some style */

  #com-atlassian-confluence #velocityObjects code {

    margin: 0 2px;

    padding: 0px 5px;

    border: 1px solid #ddd;

    background-color: #f5f5f5;

    -webkit-border-radius: 3px;

    -moz-border-radius: 3px;

    border-radius: 3px;

  }

--></style>

<pre>

And the resulting HTML displayed:

velocity-objects-in-confluence

Complete list of Confluence object available to Velocity

For completeness, I've copied over from a Confluence 5.5.x instance with links to the latest JavaDocs below. I won't be updating the list as you can use the user macro instead.