Upload user photos in the front-end. Use <input type="file" name="qqfile" /> to trigger Craft's native upload mechanism.

UserPhotoPlugin.php

<?php
namespace Craft;

class UserPhotoPlugin extends BasePlugin
{
    function getName()
    {
        return Craft::t('Upload user photos on the front-end');
    }
    
    function getVersion()
    {
        return '1.0';
    }
    
    function getDeveloper()
    {
        return 'Bob Olde Hampsink';
    }
    
    function getDeveloperUrl()
    {
        return 'http://www.itmundi.nl';
    }
    
    function init() {
    
        // Only works on the front-end
        if(craft()->request->isSiteRequest()) {
        
            // Only trigger when an user is saved
            craft()->on('users.onSaveProfile', function(Event $event) {
            
                // Get user 
                $user = $event->params['user'];
                
                // Upload the file and drop it in the temporary folder
                $uploader = new \qqFileUploader();
                
                // Make sure a file was uploaded
                if($uploader->file && $uploader->file->getSize()) {
                
                    // Get temp upload path for user
                    $folderPath = craft()->path->getTempUploadsPath().'userphotos/'.$user->username.'/';
                    
                    // Clear temp upload path
                    IOHelper::clearFolder($folderPath);
                    
                    // Make sure path exists
                    IOHelper::ensureFolderExists($folderPath);
                    
                    // Clean uploaded filename
                    $fileName = IOHelper::cleanFilename($uploader->file->getName());
                    
                    // Save uploaded file
                    $uploader->file->save($folderPath.$fileName);
                    
                    // Test if we will be able to perform image actions on this image
                    if(!craft()->images->setMemoryForImage($folderPath.$fileName)) {
                        IOHelper::deleteFile($folderPath.$fileName);
                        exit(Craft::t('The uploaded image is too large'));
                    }
                    
                    craft()->images->cleanImage($folderPath.$fileName);
                    
                    $constraint = 500;
                    list ($width, $height) = getimagesize($folderPath.$fileName);
                    
                    // If the file is in the format badscript.php.gif perhaps.
                    if($width && $height) {
                    
                        // Crop from center
                        $centreX = round($width / 2);
                        $centreY = round($height / 2);
                        
                        $cropWidth  = $width > $height ? $height : $width;
                        $cropHeight = $cropWidth;
                        $cropWidthHalf  = round($cropWidth / 2);
                        $cropHeightHalf = round($cropWidth / 2);
                        
                        $x1 = max(0, $centreX - $cropWidthHalf);
                        $y1 = max(0, $centreY - $cropHeightHalf);
                        
                        $x2 = min($width, $centreX + $cropWidthHalf);
                        $y2 = min($height, $centreY + $cropHeightHalf);
                        
                        $source = $fileName;
                        
                        // Strip off any querystring info, if any.
                        if(($qIndex = mb_strpos($source, '?')) !== false) {
                            $source = mb_substr($source, 0, mb_strpos($source, '?'));
                        }
                        
                        $imagePath = craft()->path->getTempUploadsPath().'userphotos/'.$user->username.'/'.$source;
                        
                        // Delete old user photo
                        craft()->users->deleteUserPhoto($user);
                        
                        // Crop and save
                        craft()->users->cropAndSaveUserPhoto($imagePath, $x1, $x2, $y1, $y2, $user);
                        
                        // Clear temp folder
                        IOHelper::clearFolder(craft()->path->getTempUploadsPath().'userphotos/'.$user->username);
                    
                    }
                
                }
            
            });
        
        }
    
    }

}

Tried installing this in Craft 2.0 but the plugin doesn't show up in the CP. Any ideas?