The Icelandic Saga Database: contains the texts of numerous sagas in the original Old Norse and/or translations into English, modern Icelandic, and other languages.
Heimskringla.no: contains a trove of Old Norse texts, as well as translations into modern Icelandic, Norwegian, Swedish, Danish, and Faroese.
The Skaldic Project: a database of Old Norse skaldic poetry, which, as a whole, is probably the single most reliable and direct source of knowledge about pre-Christian Germanic views of the world. (The Eddas and archaeological sources contain more information in a purely quantitative sense, but they present numerous interpretive difficulties that skaldic poetry doesn’t.) Some of these poems are also just great literature in their own right.
Blogs and Websites on Norse Mythology
It should go without saying that I don’t agree with every word on these websites. Far from it, in fact. But I think that all of these sites at least sometimes provide unique and cogent perspectives on the ancestral religion and worldview of the Norse and other Germanic peoples and their modern reformulations.
The Viking Answer Lady: excellent, thoroughly researched, in-depth articles on various aspects of life in Viking Age society.
Óðrœrir Heathen Journal: an online magazine/journal that covers historical Germanic religious practice and its reconstruction in the modern day.
The Norse Mythology Blog: written by Dr. Karl Seigfried, a professor at Carthage College.
For the record, I’m not a member of any religious (or political) organization, nor do I self-identify with any particular religious (or political) labels. But I think some of these groups have done and continue to do good work, and I sympathize with many of their aims.
Ásatrúarfélagið: founded in 1972 and originally led by Sveinbjörn Beinteinsson, this was the first Ásatrú organization in Iceland, and arguably in the world. Today it’s led by Hilmar Örn Hilmarsson, a composer who is probably best known internationally for his work with Sigur Rós.
Asatru Folk Assembly: a US-based folkish Ásatrú group headed by Stephen McNallen.
The Troth: a US-based universalist Ásatrú group whose ranks include Kveldulf Gundarsson, Diana Paxson, and James Chisholm.
Asatru Alliance: a US-based folkish (?) Ásatrú group headed by Valgard Murray.
These are all artists that deal with ancient Germanic religion and related topics in some significant capacity (or have done so at some point in their careers), and I personally like and listen to all of them.
(Disclaimer for the PC Police: I don’t care about what political views a musician might or might not privately hold, let alone endorse something so irrelevant to their music when endorsing their music.)