Customer Support
Live chat, helpdesks, knowledge bases.
The real split here is ticket queue versus shared inbox. Zendesk and Freshdesk assume high volume from strangers and give you routing, SLAs and reporting to match; Help Scout, Front and Missive assume a smaller team answering email that happens to be from customers. Pick the model before you compare features.
Editor's pick
Pylon and Plain are built for B2B support where the customers are named accounts rather than anonymous visitors. Worth a look if you know everyone who files a ticket.