Talkyard + HubSpot
HubSpot (www.hubspot.com) doesn't have any community building features. Talkyard does.
You can add a Talkyard community to your website, talk with & help your customers there, and let them talk with & learn from each other.
While using HubSpot for one-to-one support tickets, and as your CRM (Customer Relationship Management tool) and for sales & marketing.