Alright so basically I made this thread so people with weapon ideas can post about them here. Try and keep this weapon related; don't start talking about vehicles or something.
Hopefully the devs might look at this sometime.

Here's some of mine:

1."Gauss Rifle"- A big gun similiar to the railway rifle in fallout 3, but would be held like a minigun and would be more powerful. It would be like the sniper of the big gun class.
2. I think scopes should be able to be bought or found, but they should be hard to come by. It would be great if they could be taped or tied to most of the weapons in the game. Maybe break sometimes?
3.Also I'm looking forward to some recoil, I don't think there was any in Fallout 3. When you shot your gun would just spray inaccurately, but would never go up.

A good idea but there already is a Gauss Rifle as loot from Operation Anchorage and it has a scope.

Phaser Beam Sniper Rifle (I suggested it in another thread yesterday)

Better Sniper Scopes all round I think, the scopes in FO3 were a little disappointing. Nightvision and/or Thermal Scope.

Tesla Lightning Glove, close to middle range lightning projector weapon.

Home Made Circular Saw Projectile Gun

Fast Acting Foam Grenades so your enemies can't runaway, or even gas grenades to knockout hostiles.

Home made Nail Gun

Return of the Pipe Rifle.

I'd like to see something similar to WMK for Fallout 3 put in with the base game. I'd like to see my crappy assault rifle grow with me and improve as I get better as well. It'd be nice.

I just thought of a really sick low-tech easy to make weapon for survivors of WWIII.

THE BOOMERANG.

Used as a clubbing weapon and a throwing weapon that returns, super! Hopefully it hasn't been used in any of the FO games, I don't know, 360 user only.

And another, Grenade Bolas!

Fallout 3 is done. If you mean Fallout 4 then http://www.gamesas.com/bgsforums/index.php?showtopic=1067662, if it's FNV then there is also a http://www.gamesas.com/bgsforums/index.php?showtopic=1073606