From FreeDesktop.Org
ConsoleKit is a framework for defining and tracking users, login sessions, and seats.
Also note:
ConsoleKit is currently not actively maintained. The focus has shifted to the built-in seat/user/session management of Software/systemd called systemd-logind!
Documentation
No longer maintained but available here
To disable it, see:
console-kit-daemon Hogging CPU and RAMconsole-kit-daemon Hogging CPU and RAM or
Gentoo Wiki: Consolekit