Well all I can offer is my own. Obviously, these are already taken concepts, but perhaps this can inspire you something else.
One of the things we did first when looking up for species for my game is establish what we didn't want. The answer was simple: we did not want a universe that feels like Star Trek where every race is a biped humanoid with minimal cosmetic changes.
To eradicate humanoid and biped, we've looked for variants on bilateral symmetry.
Obviously, most species that have no symmetry at all are bound to die and never evolve. The reasoning is that bilateral symmetry offers organs redundancy (2 eyes, 2 hands, 2 legs, 2 lungs, etc.) As a result, even a damaged or genetically incorrect subject is still able to survive and help the species evolve as a whole.
Unilateral symmetry, as 'specialized' as it could be, would have a very hard time standing the test of time, and sooner or later, it would only survive if a mutant emerged with some form of symmetry.
Note that bilateral symmetry is not 100% accurate in our case (the heart, for example, is unique, so is the liver, etc.)
Our first series of species thus had more than bilateral symmetry (we had a species with a symmetry of 5 exactly identical parts for example).
This led us to create the 'Gorath', a worm-like species that's actually replicated 5 times together. The result is threatening and remains highly efficient (thanks to the 5 tentacles!)
In our effort to keep things different, we've tried to look further into different lifeforms, and how they could function. We're created the 'Propheon' under the assumption that is was some form of species that could survive under liquid form. It still created itself small shells and protected itself in forcefields, but it was essentially a water-like species.
We've also created our own take on the 'Robots'. However, due to lore constraints, these robots were the last remnants of the human species, and as a result, were used to interface with them. Thus, our Robots exhibit human parts (synthetic) such as a 'fake face' they can display and communicate with. Because they were meant to support humans in everyday life and that this precept has survived where the humans haven't, our robots, though definitely not android, still have a few random human pieces.
Also, I know you are not looking for energy beings, and my assumption is because you need something that has tangible grip, however, the two can be reconciled. We've created a species that's just energy (actually, they are crystals that can gather and unleash energy, similar to a sleep pattern to regenerate themselves). On their own, these rocks do little, but when unleashing magnetic energy, they're able to use neighboring rocks and fashion themselves a body. The body itself generally takes a very rough shape that could be summed as '3 limbs and a core'. They are called 'Azuldar'
You can see all of them on my indieDB entry. Perhaps the concept art will help you a bit?