Edit: clarification.
In information technology, ARM is ostensibly British but key parts of their portfolio were Euro collabs that became acquisitions or whatever (Keil, Adelante, EuroMIPS etc.)
In space technology there's a fairly strong Euro theme. E.g. i live near Glasgow, Scotland. There's a few really cool Space firms here but the larger ones appear to have strong collaborative elements with other firms in Europe (and in some cases, ownership models now that span Europe).
In farming and food supply there's a lot of large impactful collaboration across Europe.
Transport and logistics is another one where specialist firms, a lot of them Dutch for some reason, have all sorts of unexpected collaborations.
In Scotland we have a few small parts of Europe's wind turbine manufacturing industry but that's grown thanks to some euro collaborations.
There's quite a lot if you scratch the surface.
Which is still European, sure there is Brexit on the horizon, but even then it would still be European just not European Union.
ESA is a thing. ITER is a thing. But mainly all those small international projects that simply would be too niche or small for a single country or market. Im talking about stuff like wave power startup, on land fishfarms, salvage operations in the baltic, cofinancing of highways (or powerlines so that green energy may find its way across the union), et cetera..
It was designed to launch a crewed vehicle that never materialized and is too big and too costly for most commercial applications.