Thedan Script - used extensively by Gardnerian Witches
Runic Alphabets - they served for divinatory and ritual purposes, as well as the more practical use; there are three main types of Runes; Germanic, Scandinavian/Norse, and Anglo-Saxon and they each have any number of variations, depending on the region from which they originate
Celtic and Pictish - early Celts and their priests, the Druids, had their own form of alphabet known as “Ogam Bethluisnion”, which was an extremely simple alphabet used more for carving into wood and stone, than for general writing, while Pictish artwork was later adopted by the Celts, especially throughout Ireland
Ceremonial Magick Alphabets - ”Passing the River”, ”Malachim” and ”Celestial” alphabets were used almost exclusively by ceremonial magicians
A while ago I did a post on magical languages, here are some references.