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