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M+ 1m - Download and install the M+ 1m free font family by M+ Fonts as well as test-drive and see a complete character set.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Inconsolata - OSX, Productivity, Design, Typography, powerline, and Fonts
Molly (Signal fork) - Molly is an independent Signal fork for Android
Bitstream Vera Sans Mono - Bitstream Vera Sans Mono Font | dafont.com