Right now we're using:
PM: Jira - which I hate. It's overkill. The devs hate it.
Tracking, workload - clockify, not too many complaints there
Wiki - moving towards notion for this, so per client repo with project breakdowns and meeting notes
OPs - Google docs and sheets. For contracts, pricing, cashflow
CRM - trying out hubspot
Finance - moving to Xero
Anything in these areas would be interesting:
Client portal
Project wiki
Workflow automation
Create new project
Finish project
Create monthly project