Fresh, updated chart for 2.3 by Morfar here
Damage: The damage from a dead-on hit in which the shot completely hits the target.
Min. Damage: The minimum possible damage from a weapon, such as the edge of an explosion, or a single pellet from a shotgun.
Refire: Number of seconds between consecutive shots from a gun.
Speed: Speed of projectile fired from gun. Hitscan weapons hit instantly.
Blast Radius: Area of damage of explosions. Damage diminishes linearly from center of blast.
Force: Throwing force of a weapon. Note that shotgun, machinegun, and nex gun cannot be used for self-propulsion.
Spread: How much the projectiles will deviate from the fired path.
DPS: Damage per second.
Min. DPS: Damage per second resulting from Min. Damage.
Ammo per Shot: Amount of ammunition required for a single shot of a weapon.
Ammo per Second: Amount of ammunition consumed by a weapon per second, during continuous fire.
Notes:
The "-1" and "-2" after the weapon names denote primary and secondary fire modes respectively.
Since Nexuiz 2.3 Newtonian physics (with aim correction) is applied to projectile speed. Speed = Speed of projectile + Speed of player. Hitscan weapons hit instantly.
Shotgun secondary firemode takes 0.4 seconds to fire all three shots.
Machinegun primary firemode first fires a shot doing 30 damage, then all shots afterwards do 16 damage.
Electro combo does not have the properties of most other weapons, since it does not come directly from a weapon.
Crylink secondary firemode is virtually impossible to hit 100% on one target, because of it's natural plane-like spread.
Thanks to esteel for finding the forces of bullets and nex blasts, and for making a major correction to the machinegun DPS calculation.
my original chart based on 2.2.3 here