I'm evaluating template engines for email to run on the JVM (Kotlin or Java), I've looked at FreeMarker, Velocity and Mustache so far, any other ones that are worth looking at ?

FreeMarker

Has everything I need, syntax looks strange.

if-else:

<#if condition>
  ... 1
<#elseif condition2>
  ... 2
<#elseif condition3>
  ... 3
<#else>
  ... 4
</#if>

or

[#if condition]
  ... 1
[#elseif condition2]
  ... 2
[#elseif condition3]
  ... 3
[#else]
  ... 4
[/#if]

loop:

<#list 1..x as i>
 ${i}
</#list>

or

[#list 1..x as i]
 ${i}
[/#list]

value:

${value}

Mustache

Lacking decent if-else syntax, not sure if it can do loops, value syntax looks nice.

if-else

{{#condition}}
  ... 1
{{/condition}}
{{^condition}}
    {{#condition2}}
        ... 2
    {{/condition2}}
    {{^condition2}}
            {{#condition3}}
            ... 3
        {{/condition3}}
        {{^condition3}}
            ... 4
            {{/condition3}}
    {{/condition2}}
{{/condition}}

loop:

How do I loop in mustache templates ??? 

value:

{{value}}

Velocity

#if ($condition)
    ... 1
#elseif ($condition2)
   ... 2
#elseif ($condition3)
   ... 3
#else
   ... 4
#end

loop:

#foreach($i in $range)
   $i
#end

value:

$value

Any other worthwhile template engines to look at ?