Alex Mills

Implements <a href="http://en.wikipedia.org/wiki/BBCode" rel="nofollow ugc">BBCode</a> in posts.
Examples:
<pre><code>Bold: [b]bold[/b]

Italics: [i]italics[/i]

Underline: [u]underline[/u]

URL: [url]https://wordpress.org/[/url] [url="https://wordpress.org/"]WordPress[/url]

Image: [img]https://s.w.org/style/images/codeispoetry.png[/img]

Quote:

[quote]Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi.[/quote]

Bold Italics: [b][i]Test text[/i][/b]
</code></pre>

BBCode

antonchanning

This plugin adds support for bbcode markup to wordpress, bbpress and buddypress. 
It integrates with the ‘bbPress shortcode whitelist’ plugin to provide a safe 
way of enabling BBCode without giving your users access to all shortcodes.
<pre><code>Bold: [b]bold[/b]
Italics: [i]italics[/i]
Underline: [u]underline[/u]
URL: [url]https://wordpress.org/[/url] [url=https://wordpress.org/]WordPress[/url]
Image: [img]https://s.w.org/style/images/codeispoetry.png[/img] [img=Code is Poetry]https://s.w.org/style/images/codeispoetry.png[/img]
Quote: [quote]Lorem ipsum dolor sit amet, consectetuer adipiscing elit,[/quote] [quote=NAME]Lorem ipsum dolor sit amet[/quote] [quote="NAME"]Lorem ipsum dolor sit amet[/quote] [quote author=NAME]Lorem ipsum dolor sit amet[/quote] [quote author="NAME"]Lorem ipsum dolor sit amet[/quote]
Color: [color="red"]named red[/color] [color="ff0000"]hex red[/color] [color=#ff0000]hex red again[/color]
Strikeout:[s]striked this out[/s]
Center Text:[center]center me[/center]
Computer code:[code]function HelloWorld($greet = 'World') { return 'Hello '.$greet } [/code]
Font size: [size=10]10px font size[/size]
Ordered lists: [ol][li][/li][/ol]
Unordered lists: [ul][li][/li][/ul]
List Item: [li]item[/li]
Named Spoiler: [spoiler=two plus two]four[/spoiler]
Unnamed Spoiler: [spoiler]Boo![/spoiler]
Contents appear to logged in users only: [user]This is a secret message[/user]
Contents appear to non-logged in users only: [guest]Log in to see secret message...[/guest]
</code></pre>
I have enhanced support for the [url] and [quote] tags, and added potentially 
useful css style class names in the html output of the tags, to allow for 
exciting theming potential.
For example:
<pre><code>[quote=NAME]QUOTE[/quote] 
</code></pre>
will render as:
<pre><code><div class="bbcode-quote bbcode-quote-NAME">NAME<blockquote>QUOTE</blockquote></div>
</code></pre>
Or if NAME matches the login name of a user on the system, it will render as:
<pre><code><div class="bbcode-quote bbcode-quote-user bbcode-quote-NAME">DISPLAY_NAME<blockquote>QUOTE</blockquote></div>
</code></pre>
Where DISPLAY_NAME is the display name that user. With BuddyPress installed the name 
also becomes a link to their profile page, otherwise if bbPress is installed, it becomes a 
link to their forum user page.

bbPress2 BBCode

This plugin adds support for popular bbcode forum code to posts, comments, pages, bbpress 2.0 forums and buddypress activity and group forums.

BBCode vs bbPress2 BBCode