alt Hacker NewsOne of my favourite fonts is Recursive[0]. It has even more variable axes than Shantell Sans: apart from the usual weight and slant it also has a "Casual" axis as well as "Monospace" (which is continuous from fully proportional to fully monospace). I use Recursive as my terminal font, and in many other places. You can also play with it on Google Fonts[1].
Recursive is terrifically legible, especially with Casual all the way on.
I couldn't tell you why, but reading code feels much, much more natural with it than with most other fonts.
Perhaps it's the high degree of separation because every character looks meaningfully different?
The "kerning" (or whatever the visual space between letters is called in monospace fonts) is also among the best.