List of wiki engines taken from [Wiki Popularity].  Also see [Line breaks].

!!!Most Popular Open Source Wiki Engines

!![MediaWiki]
{{{<BR>}}}
!![Twiki]
{{{%BR%}}}
{{{<BR>}}}
!![TikiWiki]
!![PukiWiki]
!![MoinMoin]
{{{[[BR]]}}} (a macro)
!![PmWiki]
{{{\\}}}
{{{[[<<]]}}}
!![DokuWiki]
!![PhpWiki]
{{{%%%}}} [PhpWiki Text Formatting Rules|http://phpwiki.sourceforge.net/phpwiki-1.2/index.php?TextFormattingRules]
!![MoniWiki]
!![TiddlyWiki]
!![JSPWiki]
!![SnipSnap]
!![WackoWiki]
!![Xwiki]
!![UseMod]
{{{<BR>}}}
!![Oddmuse] 
{{{<BR>}}} (?)
!![Midgard Wiki]
!![FlexWiki]
!![Zwiki]
!![TracWiki]

!!!Most Popular Commercial Wiki Engines

!![Confluence]
!![PBwiki]
!![Socialtext]
!![Wikispaces]
!![StikiPad]

!!!Other Wiki Engines
!![MicKI]
!![ProWiki]
!![SdiDesk]
!![WikkaWiki]

!!!Other Markup

!!Textile
!!LaTeX
{{{\\}}}
{{{\\*}}}
{{{\newline}}}
!!HTML
{{{<BR>}}}
!!XHTML
{{{<br/>}}}