Coming back to the game after a long time, I see the damage range of weapons, and the fact that they have different attack speeds. Based on my experience with other games, it is easier for me to compare how good weapons are based on damage per second (DPS). Some simple assumption, like that I have 100% hit rate is fine with me if that makes it easier. After looking around a little I can't find an easy way to compare damage/speed between multiple weapons.
Yes. There are a number of damage calculators out there. This covers both the damage side and attack speed sides of the coin at once.
Alternatively, for more complex questions, such as factoring in werewolf attack speed, Zeal, Jab etc, I refer you to Thisfor a good list, if slightly dated.
The reference bible I used to use when playing D2 was This.
For an more recent compilation, This provides a reasonably thorough (at least as of 1.11) compendium.
I Hope that helps. There is so much good information out there on D2, as it has been around so long and was so popular, that I didn't think it constructive to reinvent the wheel and write down formulae here :)