Vabotu - More than slack. More than Trello. FREE.

accessiBe - Making websites accessible to people with disabilities

Tara AI - Define, plan & track mission-critical product updates, in one place.

Sim Daltonism - From the perspective of a color blind person, some colors are impossible to distinguish.

Attentiv - Simple collaboration with upvotes, polls and anonymity

Coblis - If you are not suffering from a color vision deficiency it is very hard to imagine how it looks...