You can also look up for these other topics:
Framework
Coding Standards
Boilerplate
CMS
Tool
Security
Hacktoberfest
FreeScout — Free self-hosted help desk & shared mailbox (Zendesk / Help Scout alternative)
freescout-helpdeskUVdesk Opensource Community Helpdesk Project built for all to make a Full Ticketing Support System along with many more other features.
uvdesk