UK Synaesthesia Association. https://www.facebook.com/groups/128219365930/
IASAS Community. https://www.facebook.com/groups/iaosas/
I have Synesthesia: I’m not a freak, I’m a Synesthete. https://www.facebook.com/groups/2226778430/
Mirror-Touch Synesthesia. https://www.facebook.com/mirrortouchsyn/
Synesthesia. https://www.facebook.com/groups/synesthetes/
Synæstesi. https://www.facebook.com/groups/111409222221125/
Synesthete Artists. https://www.facebook.com/groups/synestheteartists/
American Synesthesia Association. http://synesthesia.info/
Artecitta Foundation International (Spain). http://www.artecitta.es/
Deutsche Synästhesie-Gesellschaft e.V. (Germany). https://synaesthesie.org/de/
The Canadian Synesthesia Association. https://synesthesiacanada.com/
The International Association of Synaesthetes, Artists, and Scientists. http://www.theiasas.org/
The Russian Synaesthesia Association. http://www.synaesthesia.ru/
Banissy Lab, Goldsmiths University of London. https://banissylab.com/
Synaesthesia Research, University of Sussex. http://www.sussex.ac.uk/synaesthesia/
Synaesthesia Research Laboratory, Brunel University. http://people.brunel.ac.uk/~systnns/synesthes.html
Macquarie University (Australia). https://www.mq.edu.au/about/about-the-university/faculties-and-departments/medicine-and-health-sciences/departments-and-centres/department-of-cognitive-science/our-research/perception-in-action/synaesthesia-research
Max-Planck Society (Germany). https://www.mpi.nl/departments/language-and-genetics/projects/decoding-the-genetics-of-synaesthesia
Dr. Hugo Heyrman. https://www.mpi.nl/page/join-our-synaesthesia-genetics-research
Museum of the Mind. A list of synaesthesia resources. http://www.doctorhugo.org/synaesthesia/
Richard E. Cytowic. Richard Cytowic is a synaesthesia researcher. https://cytowic.net/
Synesthesia. Karen Whittingham’s website (Australia). https://synesthesia.com.au/
Synesthesia. Sean Day’s Synesthesia Website (USA). Maintains the most up to date list of types of synaesthesia among other resources. http://www.daysyn.com/index.html
Synesthesia and the Synesthetic Experience. Contains interviews with synaesthetes. http://web.mit.edu/synesthesia/www/synesthesia.html
Synesthesia Artforum. https://synesthesia-artforum.blogspot.com/
Synaesthesia links. http://www.sensequence.de/proj/projen.html
Synesthetics. Synesthesia in Art and Science (Netherlands). http://www.synesthesie.nl/
The Synesthesia Community. A webring of mainly synaesthetes personal websites. https://www.ringsurf.com/ring/synesthesia/
Vox Synaesthetica. Reflections on synaesthesia. https://voxsynaesthetica.wordpress.com/