A free app for Windows, by BusinessGoose.

Spellsword is a powerful mod that adds spell-casting functionality to weapons and shields. The concept is very simple. Weapons, shields, and some jewelry can be “spell-enchanted”, enabling the player to cast a spell with their weapon or shield. To do so, press the configurable casting button and then either attack or block.

This mod is meant to make your Skyrim gameplay a lot more enjoyable and adventurous through casting spells.

It is a very powerful mod, so be prepared to have a lot of fun with it.