Tumblr uses a very simple template language for it's themes:
{block:Text}
<li class="post text">
{block:Title}
<h3><a href="{Permalink}">{Title}</a></h3>
{/block:Title}
{Body}
</li>
{/block:Text}
Start.io also uses the same format:
<html>
<head>
<title>{Name} @ start.io</title>
</head>
<body>
{Groups}
<h1>{Name}</h1>
<ul>
{Links}
<li><a href="{Permalink}">{Title}</a></li>
{/Links}
</ul>
{/Groups}
</body>
</html>
Is it custom made, or does it use an existing template language?
If it's custom made, can you suggest some references for creating something similar?
These template engines appear custom-made, though they look extremely similar to Smarty.