ITSM
5 vendors in this category
Atlassian Jira Service Desk
https://www.atlassian.com/software/jira/service-management/features/service-desk
Freshservice
https://www.freshworks.com/freshservice/
Manageengine Service Desk Plus
https://store.manageengine.com/service-desk/
Servicenow
servicenow.com
Solarwinds Service Desk
https://www.solarwinds.com/service-desk