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I'm very curious how hive minds would work, colonial organisms, something like a siphonophore would likely develop maybe a member or two that specialize in higher thinking but something like an ant colony or bee hive or termite mound, I would expect its processing to be rather slow and work within its walls but once the members leave the outreach is not directly controlled by the intelligence...

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Though, I've wondered about colonial/eusocial organisms, that don't invent new technology, but evolve it. In other words, the hive as a whole could exhibit sapient-esque behaviours, but the members wouldn't be sophonts as we would know them.

How could they act? And interact?

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I'm not really following what you mean by not inventing but evolving technology, I'm working with the idea of army ants where the colony is not a stationary thing, once they run into a problem they could test various methods of solving it including creating objects and then remember the problem and the method that was successful...

I would think they would act very selfishly and hedonistically unintentionally as individual members react and start chain reactions to input automatically (there could possibly be some system which allows the hive to practice self-restraint though), I wonder if they would only be "semiconscious" or only partially in control of themselves, as their members move further apart I would think they would lose their sense of self as well as lose self control, the smaller groups reacting more automatically to input as larger systems of thought are broken down to the point of not functioning properly, once brought back together though I question if it would be the same ....person.... If it were it might be a rather embarrassing event for them (assuming the hives are social with one another such an emotion would likely arise to prevent stupid decisions and actions toward one another), though considering fission is a method of reproduction already practiced by hive insects on Earth and likely a method to be practiced by these alien hives I would suspect that there would be a point of scattering where once the hive is brought back together the ....person..... is lost and a new one is "born."

Interaction between hive-people would have to be very careful I think, there may be a thin line between talking and warring among them. Arguments quickly boiling down to murder as aggression develops in their unintelligent members.
Among those that hide away in a hive they would have slow communication involving sending individuals out carrying messages constructed by the colony which are then interpreted by the other person, this would be fairly easy for a human being to communicate with, a hive-people who does not talk like this and lives outside of a structure might actually communicate by having a place where individuals of the two hives interact, with the masses away from this line processing information, if the two hives merged then one could observe the other as it thinks and be considered a form of mind reading. That may be faster as lots of stuff can be said back and forth along the line.
For those hive-people I would think that individuals actually interacting would be preferably very young, having yet formed any important role in the colony, that way if a war broke out the line could be abandoned by the two colonies to prevent murder, allowing the talking members to kill one another until they settle down and possibly get picked off by some predator.

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The sapience of the colony relies on the members of the colony interacting in systems and those systems becoming more and more complex, if the colony falls apart then the sapience disappears and they become more simple until the hive-person is lost.

When in a large enough group I would expect the members to form basic systems that develop into a hive-person. So if you were to take a hive-person, with all its systems working to sustain its personality, and then suddenly broke it into groups completely separate and small enough that systems cannot sustain themselves then you've basically destroyed the hive-person, then you bring the groups back together, the members won't be able to reform the original hive-person and go back to default... a lighter way of looking at it would be amnesia, but it's more along the lines of Frankenstein's monster.

For reproduction I'm wondering if fission should be common, it's a possibility but I think they would prefer to keep themselves together, start a brand new colony and raise it until that group is large enough to form personality systems, and then teach their child. They would have to be careful not to exchange workers/absorb the child....

It seems to me that people associate emotionlessness cold calculating with hive-minds, but the way I'm developing them they'd have quite a bit of emotion with them, a maternal love to their child, embarassment to prevent the hive-person from allowing their members to do something stupid when socializing, aggression (more so on the member level) and so on... They'd also develop culture of sorts and self-preservation (at least for the hive-person).