we use zendesk -- the classic support system! It's really easy to arbitrage tickets and work to your teammates
btw we launched today and would love your support: producthunt.com/posts/findr-5
I've been researching for live chat support tools and these are some popular options : Zendesk, Intercom, Drift, Front, Gorgias, Crisp, Hubspot Chat, ...
Mailbob