GURPS Magic

 GURPS Magic has its own book, is core to the Dungeon Fantasy line and is supported with numerous Pyramid articles and individual supplements including GURPS  Magic Death Spells and GURPS Magic Plant Spells that expand on the colleges and GURPS Thaumatology: Magical Styles that gives example magical styles to help wizards be more unique. A magic as  skills system that is the original GURPS magic system.  It is strong at low to medium levels, though scales poorly at very high point levels as it becomes overwhelming in power.

This forum post lists various sources of many GURPS Magic spells and my more detailed review and analysis is here
Generic Universal Eggplant's Magic Index (New spells authored by him)

YouTube Tutorial

Another YouTube review by EasyGURPS