Latin Language Learning Materials
Fontes Discenti Latinam
Grammatica
New Latin Grammar (Project Gutenberg)
Latin Grammar Paradigms + Vocabulary
Grammar Examples
Haggis
Latin Grammar (in Medieval Portuguese)
Noun Declension Synopsis
Complete Verb Synopsis
Oxford Latin Course
Online Grammar through Texts
Latin Grammar quote unquote ”synopsis” - what synopsis is 125 pages???
Latin Grammar Aid with list of other resources
Latin Wikibook
Latin Grammar (in Medieval Italian) (link temporary)
Donatus ad Lectorem (I'll try to get a source other than Archive which is banned on my school network.)
Ars Grammatica
Doctrinale Alexandri Grammatici cum commento
Dictionaria
Wiktionary - my choice for translation. Works English to Latin. You can look up non lemma forms which is probably the best feature.
Wikidot Latin Dict. Very clunky, enter an infinitive/lemma and cross your fingers.
Latin Picture Dictionary from the Minimus series
Whitaker's Words (thx sid!)
Latvian-Latin Latin-Latvian Online dictionary
Dictionarium Palaeoslovenico - Graeco - Latinum, or, an Old Church Slavonic - Latin/Greek Dictionary
Printable Latin Mini Dictionary
Libri/Fons
Massive Library of Texts in Latin and Other Languages
PDF of the Catholicon, a Latin Grammar and Dictionary from 1460
Latin Library
Principia philosophiae cartesianae (Spinoza) (pls dont give me a cherem)
Printable Vol 1 of Institutiones of Justinian
There is some decent advice on this thread
Vera Historia Quinti, a comic book in Latin
Other Lists of Resources Lexicity (Has resources for languages other than Latin as well)
Lexicity (Has resources for languages other than Latin as well)
Thesavrvs Anbrvtalis