Included is a patch to Captcha Numbers V2 to allow fonts (with paths) to be specified in the constructor.  I needed this on a Debian Linux system to get to the Arial font which is provided by MicroSoft and installed in a sub-directory of /usr/share/fonts/truetype (which is where GD is looking for them).
Index: captcha_numbersV2.php
===================================================================
RCS file: /home/Repository/captcha/captcha_numbersV2.php,v
retrieving revision 1.1
retrieving revision 1.3
diff -c -4 -r1.1 -r1.3
*** captcha_numbersV2.php	4 Nov 2005 11:26:47 -0000	1.1
--- captcha_numbersV2.php	4 Nov 2005 14:31:38 -0000	1.3
***************
*** 1,5 ****
--- 1,13 ----
  <? 
+ /*
+ ** Edit History:
+ **
+ **	Dick Munroe (
[email protected]) 04-Nov-2005
+ **		Add a font specifier to the constructor allowing
+ **		font paths to be specified.
+ */
+ 
  /** 
  * CaptchaV2 File 
  * Generates CAPRCHA Numbers and Chars Image 
  * @author Albert Demeter <
[email protected]> 
***************
*** 24,32 ****
  /** 
  * CaptchaNumbersV2 Class 
  * @access public 
  * @author Albert Demeter <
[email protected]> 
! * @version 2.0 
  */ 
   
  class CaptchaNumbersV2 { 
  	var $length = 6; 
--- 32,40 ----
  /** 
  * CaptchaNumbersV2 Class 
  * @access public 
  * @author Albert Demeter <
[email protected]> 
! * @version 2.0.1 
  */ 
   
  class CaptchaNumbersV2 { 
  	var $length = 6; 
***************
*** 43,56 ****
  	* @return void 
  	* @param int $length string length 
  	* @param int $size font size 
  	* @param String $type image type 
! 	* @param String $captchaType text contain digits, chars or mixed 
  	* @desc generate the main image 
  	*/	 
! 	function CaptchaNumbersV2($length = '', $size = '', $type = '', $captchaType = '') { 
   
! 		if ($length!='') $this -> length = $length; 
  		if ($size!='') $this -> size = $size; 
  		if ($type!='') $this -> type = $type; 
  		if ($captchaType!='') $this -> captchaType = $captchaType; 
   
--- 51,66 ----
  	* @return void 
  	* @param int $length string length 
  	* @param int $size font size 
  	* @param String $type image type 
! 	* @param String $captchaType text contain digits, chars or mixed
! 	* @param String $font the font and optionally path to be used. 
  	* @desc generate the main image 
  	*/	 
! 	function CaptchaNumbersV2($length = '', $size = '', $type = '', $captchaType = '', $font = '') { 
   
! 		if ($length!='') $this -> length = $length;
! 		if ($font!='') $this -> font = $font ; 
  		if ($size!='') $this -> size = $size; 
  		if ($type!='') $this -> type = $type; 
  		if ($captchaType!='') $this -> captchaType = $captchaType; 
Thanks for the effort to produce this class.
Dick Munroe