Gothic is the only attested East Germanic language, and went extinct in the 9th century. A related language, Crimean Gothic, persisted until the 18th century, but it is debated whether or not this is a descendant of standard/Wulfilian Gothic. The Gothic alphabet was created by the bishop Wulfila for his translation of the Bible into Gothic (our main source for the language), and is mostly uncial Greek writing with some additions from the runic and Latin alphabets.

Since resources are few, I figured I’d compile them here and add to this post as I discover more:

General

Bibliographies and masterposts

Dictionaries and glossaries

Etymology

Textbooks

Online courses

Reading materials

Verb tables and declension tables