[php-decoda]
git=http://github.com/milesj/php-decoda.git

./bin/vendors install

// app/autoload.php

$loader->registerPrefixes(array(
    ...
    'Decoda' => __DIR__.'/../vendor/php-decoda/decoda',
));

[FMBbCodeBundle]
git=http://github.com/helios-ag/FMBbCodeBundle.git

./bin/vendors install

// app/autoload.php

$loader->registerNamespaces(array(
    ...
    'FM' => __DIR__.'/../vendor/bundles',
    // your other namespaces
));

// app/AppKernel.php

public function registerBundles()
{
    return array(
        // ...
        new FM\BbCodeBundle\FMBbCodeBundle(),
        // ...
    );
}

By default only "default" filter enabled, which provide support
for [b], [i], [u], [s], [sub], [sup] BBCodes

 {{'[b]Bold text[/b]'|BBCode}}
 {{'[u]Underlined text[/u]'|BBCode}}
 {{'[i]Italic text[/i]'|BBCode}}

 After enabling "quote" filter, you can do such things:

  {{'[quote="helios"]My quote[/quote]'|BBCode}}

fm_bb_code:
  # language code or 'default' to set it from the session 
  locale: ru-ru
  xhtml: true
  filters:
    default: enabled
    block: enabled
    code: enabled
    email: enabled
    image: enabled
    list: enabled
    quote: enabled
    text: enabled
    url: enabled
    video: enabled

Add support of whitelist tags and hooks.