Lansweeper - Lansweeper discovers Windows, Linux and Mac machines in your network.
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
GLPI - GLPI is the Information Resource-Manager with an additional Administration- Interface.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
FusionInventory - Fork of the OCS Inventory project that enables users to inventory their IT assets.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.