Escape Escape a block of text so it's valid HTML  
FeatureCheckTag Represents a JSP javax.servlet.jsp.tagext.Tag that is able to include its content if the flag specified in the attribute is enabled. 
FormatUserTag Formats a user given the username (or user object, a type and id) using UserFormats
IssueTableTag JSP tag to write a table of issues to the JSP output. 
JiraApplyDecoratorTag This is a very simple subclass of the SiteMesh ApplyDecoratorTag which automatically sets the encoding of the decorator to JIRA's encoding value. 
RenderTag Tag for rendering renderables 
SoyTemplateTag Wrapper to call a soy template 
Text2Html A wrapper around plainTextToHtml(java.lang.String)
TextTag This JSP tag is used in the <ww:text tags all throughout JIRA. 
URLTag This overrides the basic URLTag in webwork to provide JIRA specific behaviour 
WebResourceRequireTag Represents a JSP javax.servlet.jsp.tagext.Tag that is able to indicate a list of required web-resources for the current page.