According to the faq here:
http://www.sugarforge.org/content/fa...php#developer5

Our interpretation of GPL v3 is that language packs and, more generally, any code (e.g., modules, themes) that interfaces directly with (and would not work without) Sugar Community Edition form a larger work and are thus subject to GPL v3.
And it's not hard to find some projects which are releasing language packs, modules and themes for SugarCRM CE 5.0 or later in other license. Maybe somebody here could help reminding them?