Ancient
Caesar, Augustus Octavianus - Epistula ad Gaium, Cato Maior, Marcus Porcius - Monosticha Catonis, Cicero, Marcus Tullius - Brutus, Cicero, Marcus Tullius - De Amicitia, De Feminis Romanis, Edict against Latin Rhetoricians, Horatius Flaccus, Quintus - Odes of Horace, Lacus Curtius: Latin Inscriptions, Marcus Pollius Vitruvius - De Architectura, Omnia Munda Mundis
Medieval
Albertano of Brescia, Carrie: Medieval Latin Literature, Clement V: Exivi de Paradiso, De Superbia et Arrogantia Imperatoris Ioviniani, Diplomatic Codex of Brescia, Diplomatic Codex of Pavia, Epistolae Abaelardi et Heloysae, Francesci Assisensis, Sancti: Opuscula, Guillermi Ockhamensis: Dialogus, Honorius III: Solet Annuere
Modern
Alciato's Book of Emblems, Bacon, Francis: Novum Organum, Carmina Popularia, Contemporary Latin Poetry, Declarationem Hominis Iurium Universam, Descartes: Meditationes, Ecce Gratum et Optatum, Erasmus: Opera, Fides et Ratio, Galileo Galilei: Sidereus Nuncius
Patristic
Agnelli Ravennensis: Liber pontificalis ecclesiae , Ambrosi: Epistula XX, Ambrosi: Hymni, Boethii, Marci Severi: Consolatio Philosophiae, Patrologia Latina, Rabanus Maurus: De rerum naturis, The Confessions of Augustine: An Electronic Editio
A Private Library - James O'Donnell
The classification system in this library is not very intuitive, but if you dig, there are Latin, Neo-Latin, German, and English texts here.
Bibliotheca Augustana
Index of Latin literature. Navigation is in Latin: you can browse alphabetically or by century. Also includes German, English, and Greek literature.
Bibliotheca Latina
From the University of Wisconsin. Extensive list of links to Latin texts (classical, medieval, and neo-Latin). Page is entirely in Latin.
Center for Electronic Texts in the Humanities
A compendium of Latin texts.
CNP's Online Catalog - Music with Latin Texts
Lists a collection of Latin texts written to music. The texts themselves are not available online but must be ordered.
Corpus Scriptorum Latinorum
Online texts from Augustine to Vergil, sorted by author and including links to Latin, English, and foreign language translations.
Electronic Text Center Latin Resources
A good sized collection of Latin texts. Unfortunately, all but Boethius' Consolatio Philosophiae and Ovid's Metamorphoses are restricted to use by students at the University of Virginia.
Labyrinth Latin Library
A collection of ancient and medieval Latin texts.
LacusCurtius: Latin Texts
The main index page for the Latin texts on LacusCurtius: Pliny's Natural History, Frontinus, Vitruvius, Ptolemy's Geography.
Latin Texts - Orbis Latinus
Latin texts from 240 BC to present, organized by period.
Latin Texts at CELT
CELT is a resource for contemporary and historical Irish documents in literature, history and politics. This particular link takes you to their collection of Latin texts.
Latin Vulgate
A site for helping to Learn Latin, using the Latin Vulgate as reading material. English + Latin side-by-side.
Lupa
Helps for searching for classical texts. Navigation is in Latin.
Nordic Neo-Latin Literature
A searchable database of Neo-Latin (1530-1800) literature from Nordic countries.
Perseus Project Latin Texts
With accompanying English translations and links to dictionaries, commentaries, grammars, and other tools.
Project Libellus
Free Latin and Greek texts with certain redistribution restrictions.
The Later Latin Society
Latin, classical, medieval and modern; texts, symposia, grammatical aids, Attic Nights of Aulus Gellius, Res Gestae of Augustus Divus, Erasmus, and Philobiblon of Richard de Bury in Latin
The Latin Library
A collection of Latin texts: classical, Christian, medieval, and modern, including such classics as Lewis Carroll's "Gabrobocchia".
The Library
A library of Latin works, with introductions and translations (Dana Sutton, U of California).
Thesaurus Precum Latinarum - Treasury of Latin Pra
Latin prayers with English translations. Includes a guide to pronunciation of Ecclesiastical Latin.