We keep GeniusWiki free to use. You also can contribute to this product. It supports multilingual interface now. But it only has English and Chinese version. If you like GeniusWiki, you can help translating it to your language. Login to - http://www.transifex.net/projects/p/GeniusWiki/.  It has a friendly user interface to do the translation work. Once any languages complete more than 80% translation, we will bundle them in the next GeniusWiki release.

Thanks in advance.