VEDA - Vestibular Disorders Association
VEDA is an American non- profit organisation. One of the most complete websites of all problems related to dizziness, vertigo and balance. Lots of patient information on many different diagnosis in the form of articles and videos.
BTA is an independent charity supporting thousands of people in the UK with tinnitus. A very informative website with many handouts of everything tinnitus related.
SFKV - Société Française de Kinésithérapie Vestibulaire
SFKV is the French society of vestibular physiotherapists. Here you can find a handful of brochures with information on diverse vestibular pathologies. Only in French language. For English speakers I would recommend reading the VEDA website.