Sites owned by organisations that provide on-going teaching in Advaita, whether by regular meetings, retreats, discussion groups or on-line courses. These may be guided by the teachings of a particular Sage but should not be constrained by them.
If teaching is strictly according to a traditional teacher (e.g. Ramakrishna), then the appropriate category for submission would be Hinduism/Spiritual_Personalities/. If the organisation is led by a single, living Sage, then the relevant category would be Advaita/Current_Teachers/.