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(Captions written by RaptorRed)
Teeth
Xenomorph Teeth do not seem to be a preferred weapon, and are most likely used for feeding. On the other hand, these Teeth are extremely sharp and hard, and can cause massive amounts of damage.
Inner Jaws
The Inner Jaws are primarily used for head bites. This organ consists of a long fleshy, yet solid tube which can be protruded out of the Xenomorph's mouth at a very high rate of speed and is tipped with a pseudo-mouth that has small, very sharp teeth.. Xenomorphs prefer to use this attack on the head of their victim, destroying large amounts of  brain tissues in one blow and creating a quick kill, though at times they do attack other areas of a victim, causing massive damage and wounds.
Claws
Xenomorph Claws, being silicon-based, are extremely sharp and strong, able to tear though metal and many other materials. In a dire fight, these are the weapon of choice, able to dispatch many enemies in a short amount of time.
Tail
The Xenomorph's tail is the only weapon with a bit of range for most strains. This incredibly agile tail is tipped with a massive spike which can impale a victim with ease. The range of the tail is often about one and a half times the length of the individual's body length, which makes it an adept, and very powerful weapon. Certain strains have been shown to be able to stun prey with a tail strike, made to a non-vital area of the body. These strains apparently can coat the spike with some sort of paralyzing toxin though this toxin does not seem to last more than a few moments at a time, it can be a vital tool in defense of the hive.
Acid Spit
Acidic Spit is an ability attributed only to one strain, the Runner. It seems Runners can spit a highly concentrated stream of acid, almost certainly the same molecular acid they use as blood, though the loss of this does not seem to impair the Runner. It is likely though that, if it is blood, the Runner cannot perform this ability very often without dire consequences.

Anesthetic
A trait never having been seen, must exist as this is the only explanation for the Xenomorphs's ability to capture hosts with no apparent wounds. It is imperative for Xenomorphs to be able to do this, as they need hosts for their young, and an injured host could potentially die during incubation of the Chestburster. It has also been shown that hosts in a hive often sleep through or wake up just at the time of the Facehugger "attack", leading to conclusion that the hosts must be kept sedated in some way until that time.