It is easy to fall into a stance of physicalist determinism where alien technology follows the same set of physical laws so it must be the same as human technology. But mostly it's a failure of imagination.
First, to dispose of physical determinism. If this was truly so, then all technology would look exactly the same if it had the same function. Look at the nearest piece of technology. Say, your computer or mobile phone (more correctly, called a cell phone by Americans) and while certainly there are many technological similarities different brands have even specific quirks and features.
Effectively every piece of technology is not merely shaped by the physical principles of its manufacture and its ultilitarian function, but cultural aesthetics and design also plays a major role. Technologies like aircraft and spacecraft are among our most highly functional and yet there are differences in style, configuration and appearance. These differences are as much as cultural as well as reflecting preferences in technical solutions.
There are already major differences in the ways technologies are used and applied in current human cultures. They reflect the social, political, economic and cultural institutions of their nations. Compare the cultural differences between two relatively geographically close Asian cultures. The Japanese have a minimalist and often highly restrained aesthetic, while the Chinese make and design things with a gaudy and exuberant aesthetic. The difference is in part due to Japan being resource poor and China resource rich, and yet they share many similar cultural traditions their expression is different. Compare and contrast American and European aesthetic traditions as a Western example.
Even humanoid aliens will have a multitude of cultural and aesthetic differences from Earth evolved humans, due to their distinct evolutionary histories, their social, economic and political institutions, their technology will have similar differences.
Primitive humans in making artefacts as simple as stone axes displayed a tendency to go that extra bit further, in making them more symmetric than purely needed for their function. An alien humanoid might is likely to add either embellishments of the same kind in ordering the shape of a blaster to be more symmetrical or have it conform to some cultural imperative like, say, a resemblance to a sword due to its species' long historical tradition with sword wielding (this is a trivial and a not very alien example; but you should get the drift).
Differences with non-humanoid aliens will be much more extreme. There will always be the same technical functions present in their technology, but their entirely biological and cultural histories will shape remarkably different perceptions. The style and use of their technology can be expected to be different. A blaster may still be a blaster, but its shape and form may be unlike a human-made blaster. For example, xenophobe aliens are likely to always shoot first. Since this might, traditionally, be only a warning shot, learn to duck first.
One example of a TV show where differences in alien technology was commonplace, and not remarked upon, was Babylon 5 where spaceships of every alien species was designed to be different. So different, that a viewer only needed to see a spaceship you know which species it belonged to.
This approach can be used for guidance in designing the technology of an alien civilization. Devise ways their technology looks or works and make it distinctly theirs. Do the same for every alien civilization in your story too. This includes humans too, after all we're aliens from the perspective of the other, well, aliens. This works at the level of cultural aesthetics.
The next step up the great chain of being is to try imagine alien civilizations with utterly superior advance technology operating on hitherto inexplicable scientific principles. Some of this technology may be explicable, in terms of humans knowing what it does and possibly how it does, but humans may still have no idea how to make it work themselves. For example, aliens with FTL spaceships while humans can see what is does without a clue how it does it.
Other advanced technologies may simply do things without anyone having a clue how it does it. For example, "locking" humans out their solar system in some entirely inexplicable manner. (To cite another recent question here.)
If you want to achieve alien technology that seems truly alien and awesome, be unafraid to use your imagination and to do it with style.