What are some cool Sci-Fi weapons, both personal and vehicular?

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>>54681208
Power Swords from 40k are cool, in my opinion. They look and function like medieval melee weapons, but they can generate a force field around them that parts the molecules of anything that comes in contact with them.

>>54681208
Maser, ultraviolet shooter, painknife

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http://www.orionsarm.com/eg-article/48fddeba8bc05
http://www.orionsarm.com/eg-article/48602f2a62433
http://www.orionsarm.com/eg-article/4bd8a4da46165
http://www.orionsarm.com/eg-article/4823a2698dabe

Shaped charge (HEAT) bullets for infantry scale weapons.
EM accelerated darts which dump hacking nano machines or bio-weapons into the target.
Phased laser array strips or mini-EM accelerator nets on armour which shoot down projectiles or mini drone swarms.
Guns which generate a micro black hole that is set to decay inside the target, exploding.
Multi guns like pic related.
Stacked ammunition ('metal storm') guns.

Actually realistic laser weapons, which are more interesting and varied then most sci-fi would have you believe:
http://www.projectrho.com/public_html/rocket/sidearmenergy.php

>if you have force fields
Plasma throwers which use plasma shaped by force fields into a plume of star matter. (you could use by products from a units internal reactor for ammunition)
Close in protection systems which generate millions of 'shard' force fields inside enemies.
Non lethal weapon which uses force fields to compress air then pop for concussive effect.
Swarm of post-stamp sized explosive drones that can all generate a small force field for flight, they can work together to combine.

Kinetic kill missiles. No explosive payload, high velocity. Good for shipboard combat and armor penetration

Battletech's RPG had a Radium sniper rifle. If the bullet doesn't kill you, it's the radiation poisoning.

Portable Artillery.

Mason weapons in Traveller.

Bypassing shields, armor, etc. to irradiate the fuck out of the crew.

Just read in the lore that they literally bury these things under the ground because the beam can pass through rock w/o disturbing it. Holy fuck this is awesome.

Temporal Paradox Torpedos
The send you back anywhere from 1 to 100 million years.

Seeker Aerosols
A guided gas weapon

Heat Ray
Slightly conical beam that increases the energy in individual particles of whatever gets caught in the zone of effect. Can be held on target for increased effect.

>>54681208
Just look through Rifts books. Naruni Wave 2, Coalition War Campaign, and Triax 2 give a good diversity of alien, scary, and ridiculous vehicles.

Nuclear tipped bullets made with tiny amounts of metastable superheavy elements. A one gram .22 calibre warhead gives you ~15 tons of TNT equivalent.

>>54681208
My current campaign has muon catalyst weapons that flood their AoE with muons which then replace the electrons in atoms, making the overall atom smaller and heavier and therefore more likely to undergo spontaneous nuclear fusion (especially in dense materials). I got the idea from an unworkable plan for nuclear fusion thought up by Andrei Sakharov in the 1940s.

The same campaign also has strangelet munitions used to counter to the neutronium armour on spacecraft, ice-nine, solar reflectors covering trillions of square miles that focus enough energy to boil away solid stone and tachyon weapons used by time snipers (very difficult to use in game because after a player gets hit you have to make sure the sniper lives long enough to take the shot).

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>>54681208
Casaba Howitzers
http://www.projectrho.com/public_html/rocket/spacegunconvent.php#id--Nukes_In_Space--Nuclear_Shaped_Charges