TiddlyWiki vs. MediaWiki vs. TWiki vs. PhpWiki

WikiWord (CamelCase)
[[link]]
[[label|link]]

[[a link]]
[[a link|with title]]

WikiWord autolink
Otherweb.WikiWord
[[Spaced text]]
[[WikiWord][label]]

WikiWord or [somelink]
[ desc | pagename ]

http://www.example.com
[[label|http://www.example.com]]

[http://example.org The title]

http://twiki.org/ autolink
[[http://twiki.org/][label]]

http://someserver/someurl
[ desc | exturl ]

! Level 1
!! Level 2
!!! Level 3
!!!! Level 4
!!!!! Level 5

==Section==
===Subsection===
====Sub-subsection====

---+ Level 1
---++ Level 2
---+++ Level 3
---++++ Level 4
---+++++ Level 5
---++++++ Level 6

!!!Headline1
!!Headline2
!Headline3

''bold''

'''bold'''

*bold*

*bold* or
<strong>bold</strong>

//italic//

''italic''

_italic_

_italics_ or 
or
<em>italics</em>

__underline__

<u>underlined</u>

<u>underline</u>

<u>underlined</u>

{{{monospaced}}}

<tt>monospace</tt>

=monospaced text= and
<verbatim>
multi line text
</verbatim>

<tt>monospace</tt>
<code>code</code>
<pre>preformatted</pre>
<verbatim>
unparsed text</verbatim>

--strikethrough--

<s>strikethrough</s>

<strike>strikethrough</strike>

<strike>striked through</strike>

^^superscript^^

<sup>superscript</sup>

<sup>superscript</sup>

<sup>above</sup>

~~subscript~~

<sub>subscript</sub>

<sub>subscript</sub>

<sub>below</sub>

[img[local.jpg]]
[img[http://foo.bar/foo.jpg]]

[[Image:wiki.png]]

%ATTACHURL%/image.png
http://any.domain/image.png

[ http://foo.org/1.jpg size=30%] 
external image
[Upload:view.jpg align=right size=50x40] 
view uploaded image
[Upload:view.jpg | http://server/external-linkjpg ] 
view and link to another image

using custom classes, e.g.
{{right{
text
}}}

<center>Centered</center>

| left |   center   |   right |
or HTML
or CSS

<?plugin RawHtml <span align="right"> ?>right<?plugin RawHtml </span> ?>
or <div align="right"> right </div>

:indent

> quote

<<<
blockquote
<<<

: indented line

<blockquote>
multi line text
</blockquote>

;: left indent
;;: more left indent

or 
paragraph
and another level 

* Item 1
** Item 1.1
* Item 2

* Item 1
** Item 1.2
* Item 2

* Item 1
* Item 1.1
* Item 2

* list
or
- list

# Item 1
## Item 1.1
# Item 2

# Item 1
## Item 1.2
# Item 2

1. Item 1
a. Item 1.a
1. Item 2

# list

; term
: description

; term : definition

$ Term: Definition

Term:<def>
def

----

----

---

----