Fontmatrix is a font manager for Linux desktop environments. It can manage fonts installed system-wide or for individual user accounts. It relies on FreeType to render font samples, and on Qt for its user interface. Bruce Byfield hailed the creation of Fontmatrix with an article concluding with: "Finally, the long wait for a GNU/Linux font manager is ending."

Fontmatrix

Developer(s)	Pierre Marchand
Initial release	2007; 17 years ago (2007)
Stable release	0.9.100 / September 15, 2020; 3 years ago (2020-09-15)
Repository	github.com/fontmatrix/fontmatrix
Written in	C++
Operating system	Linux, OS X, Windows
Platform	x86
Available in	English
Type	Font management software
License	GPL-2.0 license
Website	github.com/fontmatrix

Fontmatrix lets users label a font with multiple tags (similar to Gmail labels), which may be activated or deactivated as sets. It also allows the user to toggle features of OpenType fonts for testing purposes. As of November 2008, the PANOSE classification present in fonts may also be used to select them by similarity.