1. Chaingun: When you just click once for the chaingun, it'll fire two bullets dead center of your crosshairs. Keep clicking (can go pretty fast if you do it right) and take out FAR enemies! Also has a higher damage output speed than the shotgun.
2. Rocketlauncher: This one is not available in Zdoom or Zandronum, unless you change compat_oldradiusdmg in the compatibility settings. The splash damage is not calculated as a sphere, but as an infinitely tall cylinder. You know those imps in E1M3 in Ultimate Doom below the supercharge sphere? You can kill them indirectly from there.
3. BFG 9000: When your projectile lands, lots of invisible spheres or cylinders fly out approximately 0.05 seconds (if I remember correctly, and it's not even 0.05, more like 0.04#########) from what ever angle the player fired the weapon (i.e: facing northwest, fires, turns southeast, blast damage travel out northwest in a cone or fan shape when projectile lands). There are about forty projectiles in the cone blast radius, so forty enemies can get damaged at a time from it. Damage varies between 100 to 800 in increments of 100. You can look at this picture I found on the link this kind fellow below this post gave me:
4. Berserk: Contrary to what most people think, it lasts until death or map completion, even without red haze.
5. Pistol, Shotgun, and Chaingun are all equally accurate to one another; they all have the exact same spread pattern.
*6. Partial Invisibilty Sphere: Enemies don't fire exactly at you; and misses alot. Good for starting infights ;)
7: Super Shotgun: Fires in a cone-shaped pattern, not like most of the hitscan weapons fire in, straight horizontal lines. More damage with two shells than the shotgun can provide; slower firing rate to counter.
