Hallo,
Es gibt zumindest ein Command-Line-Tool: 
https://github.com/etobi/Typo3ExtensionUtils
Es ist ist auch das Backend eines zweiten Tools: http://t3elmar.github.com/Ext/
Ob die CLI komfortabel ist, ist Geschmackssache. Die Ausgabe für tt_news 3.4.0:


elmar$ ext ter info tt_news 3.4.0

Extension: tt_news 3.4.0 title              News
description        Website news with front page teasers and article handling 
inside.
state              beta
reviewstate        0
category           plugin
downloadcounter    0
lastuploaddate     27.11.2012 16:23:11
uploadcomment      TYPO3 6.0 Compatibility fixes (Thanks to Lord Hader)
dependencies       array (
0 => array (
   'kind' => 'depends',
   'extensionKey' => 'cms',
   'versionRange' => '',
 ),
1 => array (
   'kind' => 'depends',
   'extensionKey' => 'php',
   'versionRange' => '5.0.0-5.3.99',
 ),
2 => array (
   'kind' => 'depends',
   'extensionKey' => 'typo3',
   'versionRange' => '4.3.0-6.0.99',
 ),
)
authorname         Rupert Germann [wmdb]
authoremail        r...@gmx.li
authorcompany      www.wmdb.de
ownerusername      rupi
t3xfilemd5         632e2b9bf272c1499090a67be82e32a1
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