What documentation / project management software do you use at your company?

Notion for all the things.

At my company, we use 5 common software project management: Atlassian Jira + Agile, Active Collab, TargetProcess, Pivotal Tracker, SprintGround.
To know more the reason why we use them, just follow what makes a good Project Management Software

Notion and Clubhouse.io

Good ole' Basecamp

clickup

Asana for project management.
Jira for dev agile management

Nimbus Note for documentation (Confluence in the past)

Shared seafile cloud, GitLab and Trello.

Trello and Google Keep for do a pretty good job (if you work all by yourself...).

PM - shared excel sheet.
Documentation - shared word docs.

Simple and to the point, works very well for teams under 10 :)