I've looked into cooperative business organisations in the past. From my recollections, these typically fall into a few classifications:

1. Political parties. Often themselves strongly aligned with cooperative or anarchist principles.

2. Labour unions. In some cases.

3. A few creatives collaborations, but with pretty loose integration. Artists, performers, or writers organisations.

4. Food-based businesses, typically smaller tea or coffee houses, or co-op food stores.

5. Mondragon Corporation. Pretty much an only-one-in-class, of an industrial cooperative. Also almost everyone's default example. https://en.m.wikipedia.org/wiki/Mondragon_Corporation

6. Producer co-ops. Often in agriculture, though others exist. Blue Diamond Almonds, and, previously, both Visa and MasterCard (the latter have both since reorganised as for-profit joint-stock companies).

I don't know of any business organisations that perform software or consulting services on a cooperative basis, though of course, the entire Free Software movement is a non-business organisation of such work.

Of course, I DDG on posting and immediately find: http://www.software.coop/info/

Though I'd argue that the fact I'd never heard of this group and their size somewhat emphasises my point.

I'm looking for tech examples.