Joomla! Extensions

sdMacro Logo Create simple commands to encapsulate text, images, HTML, Javascript, etc. for convienience or use by non-technical authors. Free! Beta
gCalMarkupLogo Insert and filter event information from Google Calendar™ events into articles using templates. V014 and free V014Demo just released!  Beta

APIs

sdConsole A simple Javascript API for issuing error, warning, log, and debugging messages to a console window, status bar, FIrebug window, or pop-up window.  Free!
sdParse A PHP class used to replace commands in text strings with text returned by callback functions.  Used by Symmetric Designs Joomla! extensions to parse article "{.../}" commands.  Handles nested commands.  Free!