pkgsrc - pkgsrc is a framework for building over 17,000 open source software packages.
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.
Conda - Binary package manager with support for environments.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Portage - Portage is source-based package manager used by Gentoo and its descendants. It controls all process from fetching source through building it, installing into clean environment to "merging" with already installed software.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.