Free Code Fonts
AlphanumericQR
by Aydi Rainkarnichi
Secret Code
by Matthew Welch
in Basic / Fixed width
Anonymous
by Geronimo Fonts
Hobo Signs
by Matias Romero
Bespoke
by Typograddict
X-Cryption
by Iconian Fonts
Mothercode
by Chequered Ink
in Fancy / Stencil & Army
Lucius Cipher
by GGBotNet
Neon Circuit
by Iconian Fonts
Hack Attack
by Iconian Fonts
Eirian
by GGBotNet
in Basic / Fixed width