Papermind - Papermind Slack App is a collaborative article-editing and document management platform for Slack
Absence - Employee vacation tracking system
Slenke - Project management & team collaboration
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
PTO Ninja - Slack app helping teams better manage time off