RANDOM.ORG - RANDOM.ORG offers true random numbers to anyone on the Internet.
Absence - Employee vacation tracking system
Wheel Decide - Wheel Decide is a free to use web-based spinner platform that allows the people create their own digital wheels system for prize giveaways, decision making, games and much more.
CWS TimeOut - CWS TimeOut is an online leave tracking software or absence management solution that can also be installed on the server.
Wheel of Names - Free and easy to use spinner. Used by teachers and for raffles. Enter names, spin wheel to pick a random winner. Customize look and feel, save and share wheels.
PTO Ninja - Slack app helping teams better manage time off