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
- Gothic version of Wikipedia
- Gutiska Razda, The site of the Gothic Language. Also available in Spanish and in Swedish.
- Gothic phrasebook (Russian-English-Gothic)
- A. Judzis, Gothic for Travellers
- Gothic from Lingunetics.net
- Gothic Names
- Names from Other Early Cultures from Medieval Names Archive
- Himma Daga, news in Gothic
- Gothic-L mailing list
Bibliographies and masterposts
- Links & Bibliography from the University of Graz
- Gothic Bibliography
- The Gotish Tongue Website by Matthew Carver
- Gothic Links Page
Dictionaries and glossaries
- TranslateGothic, a searchable, bidirectional Gothic dictionary
- Freelang.net, Gothic-English-Gothic dictionary
- Gothic Language Dictionary, searchable and bidirectional
- OE Eclipse Gothic Dictionary
- Gothic Dictionary with Etymologies by András Rajki
- Gothic dictionary from Himma Daga
- Koebler-Gerhard Gothic-English Dictionary
- Koebler-Gerhard Gothic-German Dictionary
- Gotisch-Griechish-Deutsches Wörterbuch by Wilhelm Streitberg
- Deutsch-Gotisches Wörterbuch by Oskar Priese
- Heyne's Gothic Dictionary (Gothic-German)
- Dizionario essenziale italiano-gotico
Etymology
- Gothic Dictionary with Etymologies by András Rajki
- A comparative glossary of the Gothic language with especial reference to English and German by G. H. Balg
- Grundriss der gotischen Etymologie by Sigmund Feist
Textbooks
- Grammar of the Gothic Language by Joseph Wright
- A Gothic grammar with selections for reading and a glossary by Wilhelm Braune (note: The translator, G. H. Balg, uses a simplified English spelling which may make it hard to read.) Also available in German.
- An introduction, phonological, morphological, syntactic to the Gothic of Ulfilas by Thomas le Marchant Douse
- Gotisches Elementarbuch by Wilhelm Streitberg
- An Introduction to the Gothic Language by Thomas O. Lambdin
- An Introduction to the Gothic Language (Introductions to Older Languages) by William H. Bennett
Online courses
- Gothic Online at the University of Texas at Austin
- Gothic For Goths by Benjamin Johnson
- An Introduction to Gothic by David Salo
- Gutiskô Razda Hrabnskuftôs
Reading materials
- Wulfila Project, the Gothic Bible
- Yeihos Bokos, an ongoing project to translate the Bible into Gothic
- Gotisch-Projekte
- Himma Daga, news in Gothic
- Bagmê Blôma (also here), a Gothic poem written by J.R.R. Tolkien
- Atta Unsar (The Lord's Prayer)
- Qimandáu Triggwái (O Come, All Ye Faithful)
- Wulþus, hazeins jah hauheins, a translation of Theodulph of Orleans’ “Gloria, Laus, et Honor”.
Verb tables and declension tables
- Gothic syntax
- Gothic grammar from The Gotish Tongue Website
- Gothic declension on Wikipedia
- Gothic verbs on Wikipedia
- Gothic verb declension tool from Verbix.com