Anka/Coder vs Bitstream Vera Sans Mono

The zero really stands out and looks quite different from zeroes in most other fonts. The addition of the slash means you'll never have to second guess if that character is actually an "O" or if it is a "0".

Because it's open source, Anka/Coder is freely available to anyone.

Anka/Coder has just the right balance between style and readability.

Condensed and, even to a greater extent, narrow versions allow for compact lines without sacrificing readability.

You can fit a lot of text on the screen.

Width is just right (not too narrow, not too wide). Many other fonts lack this.

Smooth at small sizes while still clear.

All characters are easy to recognize at small sizes (comma, period, etc).

This is subjective but this font is very easy to read. The letters are all spaced and sized properly.