Which yeast/bacteria produce no, or little alcohol (like Bionade)?

Producing a variety of different beer styles, we are able make adult friends happy, however children are left out :(

I therefore wanted to ask if somebody knows where to look for yeasts that are not producing alcohol, yet ferment a wort?

On Wikipedia one can read about this commercial product Bionade (wikipedia), which suggest that some person at a brewery (after claimed years of experimenting) was able to cultivate a mico-organism (not really a yeast but a bacteria) that instead of generating alcohol, generates gluconic acid.

He experimented for eight years in a bathroom laboratory, spending €1.5 million of the brewery owner Peter Kowalsky's money. He isolated a strain of bacteria capable of converting the sugar that normally becomes alcohol into nonalcoholic gluconic acid, which he used to ferment the new drink.[3]

Is there maybe an non-proprietary, open source version of this bacteria?