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I love SF Mono and use it everywhere.

The reason SF Mono and Monaco are not on the list is probably because they are proprietary.

If you like SF Mono but don't have a Mac, check out Deja Vu Mono. To my eye, they are very similar.

If you like SF Mono and don't have a Mac, you could just download it from them and break Apple's licensing agreement.

For me this is no different than listing paid fonts like Berkeley Mono.