Bront is a fork of Ubuntu Mono geared towards programming.

• $ has a full pillar
• 0 has a slash
• _ is narrower in order to discern consecutive characters
• - is the same width as _
• * is centered vertically to align with +, -, and =
• G has a horizontal bar
• % has actual circles
• i, j, l, and J do not have serifs
• J has a longer tail
• * has 6 spokes
• ~ is more wavy in order to further differentiate it from -
• t has the same ascender height as l

https://github.com/chrismwendt/bront

• FontForge software http://fontforge.github.io/
• Design With FontForge book http://designwithfontforge.com/
• ImageMagick tool http://www.imagemagick.org/