Age of Weapons

All axes: Harvest wood faster

All spears: Right click throws the weapon

Warhammer: Right click on a stone block turn it into cobblestone, left click knocking the target back

Multitool: Has all features of the vanilla tools, right click turn dirt into farmland

Traps: place it on the ground 

Mystic Sword: Left click gives the target a slowness effect

Pufferfish stick: Left click give the target a poison effect

Unholy Scepter: Right click spawn monsters

Scepter of Changing: Right click changes some blocks (try grass, stone, dirt, sand, sandstone, ice, sandstone, ...)

Aether Wand: With the right click can you fly, with the left click gives the target a levitation effect

Nether Wand: Right click creates a area of fire on the ground, left click sets the target in fire

Holy Wand: Right click heals you

Maelstrom Wand: Right click creats a effect cloud ring with a wither effect

Curse Wand: Right click creates a effect cloud with a damage effect on the corner and a little damage effect in the middle (that damages you), left click damages the target and you a little bit 

Basic Wand: Right click creates a effect cloud ring with a weakness effect

Storm Wand: Left click knocks the target back

Warhorns: Right click creates a area effect cloud for a group buff

Clawsword: Right click turn dirt into farmland  

Claw: Right click turn dirt into farmland

Toxin: Drink it with a right click

Radioactive Toxin: Drink it with a right click

Industrial Miner: Mines a 3x3 area of stone

Industrial Excavator: Mines a 3x3 area of dirt

Industrial Multitool: Mines a 3x3 area of all blocks, right click turns dirt into farmland

Assassin Armor: Gives you a jump boost II effect, when you wear all parts

Ninja Armor: Gives you a speed boost II effect, when you wear all parts

Light Bow: Shoots light arrows

Shadow Bow: Shoots knockback arrows

Crossbow: Shoots strong non-gravity arrows

Master Armor: Gives you a luck V effect, when you wear all parts

Herobrines Sword: Has some Enchantments. Right click creats a effect cloud ring with a wither effect

Cast Net: Gives the target a slowness effect

Grapling Iron: Gives the target a slowness effect

Machete: Can harvest leaves and plants

Scythe: Can harvest leaves and plants

Night vision goggles: Gives you an night vision effect if you wear it

Harpoon: Right click throws the weapon

Throwing knive / throwstar/ kunai / grenades: Right click throws the weapon

Paradox Staff: Right click creats a effect cloud ring with a wither II effect

Sentinel Glave: Right click creats a effect cloud ring with a slowness III effect

Lance: Knocking the target back

Heavy Staff: Knocking the target back

And some other weapons have other cool side effects ;)