The target was achieved 14 days ahead of schedule. At the time of writing (7.30 AEST), the total raised was US$1,516,423.
"Free" refers to the hardware and software with the phone to use Plasma Mobile, a mobile version of the KDE software that is used on the Linux desktop.
The mobile operating system for the Librem 5 will be based on existing standards and based on the Debian GNU/Linux distribution.
The bid to build a Linux-based phone comes six months after Canonical, the company behind the Ubuntu Linux distribution, said it was discontinuing development of its Ubuntu Phone operating system.
However, the Ubuntu Phone operating system has been picked up by developer Marius Gripsgård who has ported it to many other models apart from those which Canonical had ported. Gripsgård's project is known as UBports.
The Librem 5 phone is expected to be available in early 2019.
Purism says it would be the world's first ever IP-native mobile handset, using end-to-end encrypted decentralised communication.