Eldar Weapons:

Skuriken Pistol (see below, pistol one-handed)
Shuriken Catapult (Fire a skuriken at high-speeds toward targets. The shurikens themselves have very sharp edges, sharp enough to cut through the power armour of Space Marines or the chitin of Tyranids, rifle two-handed)
Skuriken Cannon (see above, heavy weapon two-handed)
Death Spinner: Draws the enemy into the warp, death is very gruesome, needless to say
Fusion Gun: It's a melta-gun(just like the Imperial one)
Firepike: Melta-gun in the shape of a pike with longer range
Ranger long rifle: Sniper rifle utilized by Eldar rangers
Flamer: Flamethrower
Scatter Laser: Think of a gatling gun but it fires lasers instead (mounted on vechiles only)
Missile Launcher: Launches missiles
Same as Imperial
Plasma: IT BURNS!!! Raw uncontrolled plasma eats away the poor sap(s) who got hit
Bright Lance: Eldar Lascannon
Lasblaster: Eldar Lasgun, better fire-rate than the Imperial version
Hawk's Talon: Lasblaster with a signifigant increase in damage potenial.
Reaper Launcher: Launches missiles at the enemy (two handed)