Absence - Employee vacation tracking system
Quip: Team Documents for Slack - Create, share and get notified about Quip docs in Slack
CWS TimeOut - CWS TimeOut is an online leave tracking software or absence management solution that can also be installed on the server.
Trainual + Slack Integration - Capture knowledge or access training right inside Slack
Appogee Leave - PARIM Workforce Management Software
WorkStudio - Simple, collaborative work management