BAT pre-amps and Sonic Frontiers pre-amps do and they're very nice
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Of course, Balanced Audio Technology (BAT) comes to mind as well as the Aesthetix (sp) Callisto. Also, any of a number of tube pre using transformer-coupled outputs usually also offer balanced outs, such as Audio Note and possibly the soon to be released WAVAC "reference" pre-amp. I'm sure there are others as well.