ioqayin:

I have quite a few. 

Graveyard Wanderers by Dr Tom Johnson, an exploration of necromantic spells and rituals in the Swedish tradition. 

Trolldom by Johannes Gårdbäck, a book of spells (very well organized, in my opinion) in the Scandinavian tradition of Trolldom. 

Encyclopedia of 5,000 Spells by Judika Illes is, of course, a classic. 

Carmina Gadelica by Alexander Carmichael is a book of Scots Gaelic spells and prayers and blessings. 

Mastering Witchcraft by Paul Huson is technically a book of spells and rituals. 

The grimoires are much the same. Grimoire.org is a great online resource as a quick reference guide. 

Witches’ Potions and Spells by Katheryn Paulsen is a quite literal list of spells. Caution should be taken, as many of them contain poisonous ingredients. 

Those are the ones I like and reference often.