Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.

accessiBe - Making websites accessible to people with disabilities

tawk.to - tawk.to is a free live chat app that lets you monitor and chat with visitors on your website or from a free customizable page

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

JivoChat - JivoChat is a live chat that enables you to talk to visitors on your website

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