This page attempts to list fonts that are missing from Debian (including nice non-free ones).
free
This section lists fonts that are under a free licence or look like they are DFSG-free.
Fonts covering scripts currently missing in Debian:
Cardo by David J. Perry, MUFI v3 compatible - old European glyphs (OFL 1.1)
Adinatha Tamil Brahmi by Shriramana Sharma, Vinodh Rajan and Udhaya Shankar, covering some Brahmi (OFL 1.1)
Ahuramazda by Ernst Tremel, covering Avestan and some Inscriptional Pahlavi (OFL 1.1)
Annapurna SIL by SIL, covering Common Indic number forms (OFL 1.1)
Mingzat by SIL, covering Lepcha (OFL 1.1)
Namdhinggo SIL by SIL, covering Limbu (OFL 1.1)
Tai Heritage Pro by SIL, covering Tai Viet (OFL 1.1)
ZH Mono by Zach Harrison, covering Inscriptional Pahlavi and Inscriptional Parthian (dual license: OFL 1.1 and GPL 3)
Fonts belonging to the same family or “foundry line” of fonts already in Debian:
Lateef for Arabic and Mondulkiri for Khmer from SIL (OFL 1.1)
GFS Decker, GFS Philostratos and GFS Goschen as well as GFS Bodoni, GFS Elpis and GFS Pyrsos and possibly the majuscule typefaces from Greek Font Society (OFL)
Other fonts:
ttf-fossfonts from https://wiki.ubuntu.com/SeveasPackages
Comfortaa from Johan Aakerlund (OFL)
New Athena Unicode from the American Philological Association (OFL)
Ormaxx (bitmap fonts for x (pcf/bdf))
Rockets (not really that nice)
Several Bengali fonts from Ekushey (OFL)
Various fonts from The League of Moveable Type (OFL, PD)
Dark Garden is a decorative outline font of unusual shape
Google Web Fonts is a collection that contains a lot of free fonts. See 583619
EB Garamond (repo) is a nice font family with good coverage of the Latin script and OT features (OFL) – has a couple punctuation marks currently missing in Debian
non-free
This section lists candidates for the non-free section of the archive. Do not add fonts that you know we cannot distribute.
Code2000 and its companion fonts by James Kass, covering Buhid, Cham, Ol Chiki, Phags-pa and Rejang (GPL 3, copyright/license in dispute)
Siddhanta by Mihail Bayaryn, covering Vedic extensions; the font is using the CC-by-NC-ND 3.0 license, but the author has previously made fonts available with GPL; as other projects (Fedora, SIL) are working on extending their Devanagari fonts the need for this non-free font may be outwaited