Dudle - Dudle is an online scheduling application, which is free and open source.
OpenMAINT - openMAINT manages movable assets, the real estate, and the related maintaining, logistic and economic activities, GIS and BIM
Pulse 24/7 - Booking & scheduling mobile app for service providers
Fishbowl Warehouse - Fishbowl Warehouse is the leading Warehouse Inventory Management solution that helps you keep track of your inventory levels and movements, so you can make better decisions about what to stock and when to order more products.
MakePlans - Online appointment booking - MakePlans
AssetTiger - AssetTiger is a free community service and cloud-based asset management tool.