Dictionaries:
Du Cange's Glossarium Ad Scriptores Mediae et Infimae Latinitatis
http://mateo.uni-mannheim.de/camenaref/ducange.html
A Grammatical Dictionary of Botanical Latin
http://www.mobot.org/mobot/latindict/introduction.shtml
The Morgan-Owens Neo-Latin Lexicon
https://neolatinlexicon.org/search/
Perseus: Latin Word Study Tool
http://www.perseus.tufts.edu/hopper/morph?&la=la#lexicon
Whitaker's Words Online
https://latin-words.com/
Ein Wörterbuch des Lateinischen von Petrarca bis 1700 (Johann Ramminger) http://ramminger.userweb.mwn.de/
Other Reference Works:
Ad fontes: Adriano Cappelli's Lexicon abbreviaturarum
https://www.adfontes.uzh.ch/en/ressourcen/abkuerzungen/cappelli-online/characters/up/1
Euratlas: Digital Historical Cartography of Europe
https://euratlas.com/
Latin Place Names Found in the Imprints of Books Printed Before 1801
https://rbms.info/lpn/
ORBIS LATINUS online [Latin place names]
http://www.columbia.edu/acis/ets/Graesse/contents.html
ALIM (Archivio della Latinità Italiana del Medioevo)
http://www.alim.dfll.univr.it/
An Analytic Bibliography of On-line Neo-Latin Texts (Dana F. Sutton)
http://www.philological.bham.ac.uk/bibliography/
Biblioteca Italiana
http://www.bibliotecaitaliana.it/
Bibliotheca Augustana (Ulrich Harsch)
https://www.hs-augsburg.de/~harsch/a_summa.html
Bibliotheca Latina IntraText
http://www.intratext.com/LATINA/
Les Bibliothèques Virtuelles Humanistes
http://www.bvh.univ-tours.fr/index.htm
CAMENA: Latin Texts of Early Modern Europe (Wilhelm Kühlmann)
http://mateo.uni-mannheim.de/camenahtdocs/camena.html
Centre for Danish Neo-Latin (Danish Neo-Latin Heritage Corpus, Database of Nordic Neo-Latin Literature)
https://www.cdnl.dk/
The Central and Eastern European Online Library
https://www.ceeol.com/
Contemporary Latin Poetry (Marc Moskowitz)
https://suberic.net/~marc/latinpoetry.html
Corpus Scriptorum Latinorum: a digital library of Latin literature
http://www.forumromanum.org/literature/index.html
CroALa: Croatiae auctores Latini bibliotheca electronica
http://croala.ffzg.unizg.hr/
digilibLT - Digital Library of late antique Latin texts
https://digiliblt.uniupo.it/index.php
Early Modern Letters Online
http://emlo.bodleian.ox.ac.uk/
Epistolæ: Medieval Women's Letters
https://epistolae.ctl.columbia.edu/
Europeana. The European Digital Library.
http://www.europeana.eu/
Gallica. Bibliothèque nationale de France.
http://gallica. bnf.fr
De Heinsius-Collectie
https://www.let.leidenuniv.nl/Dutch/Latijn/Heinsius.html
The Latin Library:
http://www.thelatinlibrary.com/index.html
The Medieval Beastiary (David Badke)
https://bestiary.ca/
Monumenta Germaniae Historica
https://www.dmgh.de/
Perseus Collection: Humanist and Renaissance Italian Poetry in Latin
http://www.perseus.tufts.edu/hopper/collection?collection=Perseus:collection:PDILL
Poetiditalia: Italian Poetry in Latin 13th-16th centuries
https://www.poetiditalia.it/public/index
TERMINI - Vernetzter Wortschatz lateinischer Wissensliteratur der Frühen Neuzeit
http://mateo.uni-mannheim.de/termini/index.html
Thesaurus Musicarum Latinarum: Online Archive of Music Theory in Latin
https://chmtl.indiana.edu/tml/
Tirolensia Latina
http://www.literature.at/collection.alo?from=1&to=50&orderby=author&sortorder=a&objid=10863&page=
The Universal Short Title Catalogue. University of St Andrews.
http://ustc.ac.uk/
Digital Texts (Individual Authors and Texts):
The Aberdeen Bestiary - MS 24
https://www.abdn.ac.uk/bestiary/
Alciato's Book of Emblems
https://www.mun.ca/alciato/
Bibliotheca Erasmiana Hispanica: Erasmus in Spanish Libraries (Julián Solana Pujalte)
http://www.uco.es/humcor/
Boethius: Consolatio Philosophiae
https://faculty.georgetown.edu/jod/boethius/boethius.html
Bridging the Continental divide: online edition of Delitiae Poetarum Scotorum (1637)
https://www.dps.gla.ac.uk/
Corpus of Ioannes Dantiscus' Texts & Correspondence (Anna Skolimowska, Magdalena Turska, Katarzyna Jasińska-Zdun)
dantiscus.al.uw.edu.pl
Corpus Thomisticum
http://www.corpusthomisticum.org/iopera.html
The Latin Josephus
https://sites.google.com/site/latinjosephus/
Digital Libraries:
Polonia (National Library of Poland)
https://polona.pl/
Mittelalterliche Handschriften in Österreich (Medieval Manuscripts in Austria)
manuscripta.at
Other Resources:
Early Modern Resources
https://earlymodernweb.org/resources/index.html
Internet Medieval Sourcebook
https://sourcebooks.fordham.edu/sbook.asp#ecf
Theoi Project: Greek mythology
https://www.theoi.com/
Vatican News In Latin
https://www.vaticannews.va/en/podcast/vatican-radio-news-in-latin.html