SpreadSheetPlugin for dynamic content 
The 
SpreadSheetPlugin offers 100 functions. Functions are evaluated at page view time. A formula can be placed anywhere in a topic, not just in a TWiki table.
Examples: 
-  
$INT(7/3)
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$AVERAGE($ABOVE())
  -  
$IF($T(R2:C1) > 100, over limit, $T(R2:C1))
  -  
$SUBSTITUTE(Good morning, morning, day)
  -  
$TIMEADD($TIME(), 2, week)
 
 
Here is a complete example - to space out 
WikiWords, write: 
%CALC{"$PROPERSPACE(TWikiGuest)"}% 
to get:
TWiki Guest
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Contributors: TWiki:Main.PaulineCheung