PhpWiki vs. TiddlyWiki vs. Oddmuse vs. Foswiki vs. Zim

WikiWord or [somelink]
[ desc | pagename ]

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

optional, default on:
[[page name]]

optional, default off:
PageName
[PageName] → [1]
[[[page name]]] → [1]
[PageName text] → text
[[page name|text]] → text

Depending on plugins:
[text](page) → text

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

CamelCase [[foobar:subpage]] +subpage 

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

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

http://example.com/
[http://example.com/] → [1]

optional, default on:
[http://example.com/ text] → text

Depending on plugins:
[text](http://example.com/) → text

External Link
http://foswiki.org/ autolink
[[http://foswiki.org/][label]]

wp?Wiki_Engine http://wikimatrix.org 
ftp://somehost/share
\\host\share\..

!!!Headline1
!!Headline2
!Headline3

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

Depending on plugins:
## two
### three
== two ==
=== three ==

section
=======

subsection
----------

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

=== Heading ===

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

''bold''

Depending on plugins:
*bold*
**bold*
'''bold'''

*bold*

**bold**

_italics_ or 
or
<em>italics</em>

//italic//

Depending on plugins:
*italic*
/italic/
//italic//
''italic''

_italic_

//italic//

<u>underlined</u>

__underline__

Depending on plugins:
_underline_
__underline__

<u>underline</u>

__underline__

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

{{{monospaced}}}

Depending on plugins:
`mono`
##mono##
[code]mono[/code]
<tt>mono</tt>
<code>mono</code>

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

``monospace``

<strike>striked through</strike>

--strikethrough--

via bbCode plugin:
[s]strike through[/s]

<strike>strikethrough</strike>

~~strike~~

<sup>above</sup>

^^superscript^^

via bbCode plugin:
[sup]superscript[/sup]

<sup>superscript</sup>

^{sup}

<sub>below</sub>

~~subscript~~

via bbCode plugin:
[sub]subscript[/sub]

<sub>subscript</sub>

_{sub}

[ 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

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

http://example.com/pic.jpg

Depending on plugins:
[[image:Name|Text|URL]] and variants
![text](URL)

%ATTACHURL%/image.png
http://any.domain/image.png
%IMAGE{"image.png"}%

{{./image.png}}

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

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

no example known

| left |   center   |   right |
or HTML
or CSS

not implemented

;: left indent
;;: more left indent

or 
paragraph
and another level 

:indent

> quote

<<<
blockquote
<<<

Depending on plugins:
> text

[quote]
text
[/quote]

: one
:: two

<blockquote>
multi line text
</blockquote>

indent with tabs

* list
or
- list

* Item 1
** Item 1.1
* Item 2

* one
** two

* Item 1
* Item 1.1
* Item 2

* List item
* sub items
* with indent

# list

# Item 1
## Item 1.1
# Item 2

Depending on plugins:
1. one
2. two

# one
## two

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

1. List item
a. with sub items
b. ...

Term:<def>
def

; term
: description

Depending on plugins:
; term: definition

$ Term: Definition

not implemented

----

----

Depending on plugins:
----

---

not implemented