My favorite is still Go Mono (and not only for Go) - mostly because I prefer the good old "typewriter-style" fonts with serifs. "Sans-serif" monospace fonts loo

My favorite is still Go Mono (and not only for Go) - mostly because I prefer the good old "typewriter-style" fonts with serifs. "Sans-serif" monospace fonts look odd to me because most letters are sans-serif, but then they have to add serifs to I, i, l, 1 etc. to avoid having them look "skinny".