I was looking at your code for Simple Image Sizes plugin, and I found this lines:
Copyright 2010 Nicolas JUEN (firstname.lastname@example.org) - Be-API
This plugin is not free to usage, not open-source, not GPL.
You can't use and modify this plugin without the permission of Be-API. (email@example.com)
I wonder how it's hosted here, since the guidelines for the WordPress Plugin repository say that
Your plugin must be GPLv2 Compatible.