Capfirst: {{ "capitalized"|capfirst }}

Centered:
<pre>
{{ "center"|center:20 }}
</pre>

First letter: {{ "first"|first }}

Fix ampersands: {{ "&"|fix_ampersands }}

Force_escape: {{ "<b></b>"|force_escape }}

Joined: {{ list|join:", " }}

Last: {{ "last"|last }}

Length: {{ list|length }}

Length is 2?: {{ list|length_is:2 }}

Left adjust: 
<pre>
{{ "left"|ljust:20 }}
</pre>

Lowercase: {{ "LOWERCASE"|lower }}

Right adjust:
<pre>
{{ "right"|rjust:20 }}
</pre>

Uppercase: {{ "uppercase"|upper }}