Electric Puppet Theatre is primarily lettered with EPT Kazoo, but we use many additional free fonts to fill in the details. Here are some samples (images link to the pages that they are taken from, font names link to external font pages, and Debian/Ubuntu packages are indicated where available)
Dustismo Fonts
GPL-licensed fonts from dustismo.com, available via the ttf-dustin package.
El Abogado Loco
Domestic Manners
Wargames
Linux Libertine
A large and elegant family of serif ("Libertine") and sans-serif ("Biolinum") OFL-licensed fonts designed as an altertive to Times New Roman and Helvetica. Available via the fonts-linuxlibertine package.
Linux Libertine
Linux Biolinum
Linux Libertine Capitals
John Stracke
Available via the ttf-essays1743 and ttf-isabella packages.
Essays 1743 -- based on the typeface in a 1743 English translation of Montaigne's Essays; featured in Mark Pilgrim's Dive Into HTML5.
Isabella -- "based on the calligraphic hand used in the Isabella Breviary, made around 1497, in Holland, for Isabella of Castille, the first queen of united Spain."
The League of Movable Type
A small collective of designers making open fonts intended to beautify the web.
League Gothic
Orbitron
Knewave
wmk69
A series of elegant fonts from a professional stone cutter who started digitizing his designs in 2010.
Berenika, based on Celtic inscriptions.
Medieval Sharp
TLWG
A collection of scalable fonts from a Thai Linux project, including useful typewriter and handwriting fonts from Poonlab Veerathanabutr, available via fonts-tlwg-typewriter and fonts-tlwg-purisa.
TlwgTypewriter
Purisa
Misc.
Euler Fraktur (medium-weight), from ttf-lyx, a package of TrueType versions of some of the TeX fonts.
URW Bookman, from (URW)++ Design & Development, available via the ghostscript libgs9-common package.
Ubuntu, available via ttf-ubuntu-font-family
MgOpen Moderna (from Magenta Inc.)
Steve Jordi's SteveHand, avaiable via ttf-sjfonts.