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I wonder which is the most fully featured free Helvetica clone?

TeX Gyre Heros[0] is the most faithful (to the original Helvetica masters) FOSS reproduction that I'm aware of.

Oh man TeX Gyre. That brings me back. Good to know it’s solid!

Check “TeX Gyre Heros”. It is featured version of Nimbus Sans (aka Helvetica digitised by Bitstream) which were donated to X Consortium back then.