Legal Sources
Royal Spanish Legislation:
Universidad de Santiago de Compostela (links to many of the most important sources of Iberian law)
http://www.usc.es/histoder/historia_del_derecho/textos.htm
Recopilación de las Leyes de Indias (@CONGRESO de la REPÚBLICA del PERÚ)
http://www.leyes.congreso.gob.pe/leyes_indias.aspx
California's Legal Heritage - Spanish Law in the Americas (UC Berkeley)
http://calegalheritage.law.berkeley.edu/spanish-law-in-america.html
Siete Partidas
Recopilación de Leyes de los Reynos de las Indias (1680)
http://www.gabrielbernat.es/espana/leyes/rldi/rldi.html
Tesauro de Legislación Histórica (searchable)
http://www.mcu.es/archivos/lhe/Consultas/consultaTesauro.jsp
Jurisprudence:
De Indiarum Iure, Max Planck Institute for European Legal History
https://dlc.mpg.de/partner/mpilhlt/search/-/-/1/-/DC%3Adeindiarumiure/
Collected "Works" @ School of Salamanca
https://www.salamanca.school/en/index.html
Spanish Legal Documents, 15th-19th Centuries (Library of Congress)
https://www.loc.gov/collections/spanish-legal-documents-15th-to-19th-centuries/
Other Secular Legislation:
Chancelaria Régia Portuguesa, 1211-1826
http://digitarq.arquivos.pt/details?id=3813585
O Governo dos Outros (searchable tool for Portuguese legislation)
http://www.governodosoutros.ics.ul.pt/?menu=inicio&lang=uk
Toledo (Esp.) y sus Cuadernos de Cortes (1346-1563)
http://www.toledo.es/toledo-siempre/exposiciones-virtuales/toledo-y-las-cortes-de-castilla/
Transcriptions of all Saint Dominguan and Haitian constitutions from 1790 to 1860 (Dr. Julia Gaffield)
https://haitidoi.com/constitutions/
Civil Law:
Justinian (Institutes, Code, Digest)
http://www.thelatinlibrary.com/justinian.html
Justinian Code (English Translation)
https://droitromain.univ-grenoble-alpes.fr/Anglica/CJ1_Scott.htm
Theodosian Code
http://www.thelatinlibrary.com/theodosius.html
Corpus Iuris Civilis Citation Form (not a source of Law itself, but a useful aid for recognizing citations)
http://amesfoundation.law.harvard.edu/digital/CJCiv/CitationForm.html
UNAM
https://biblio.juridicas.unam.mx/bjv
Civil Law Online (LSU)
Canon Law:
Corpus Iuris Canonici (1582) - UCLA
http://digital.library.ucla.edu/canonlaw/
The Canons and Decrees of the Council of Trent (English), @ Hanover Historical Texts Collection
https://history.hanover.edu/texts/trent.html
Concilio de Trento (castellano)
http://www.intratext.com/x/esl0057.htm
Bullarium Romanum
http://dl.icar.beniculturali.it/biblio/_view_volume.asp?ID_VOLUME=2120
Papal Encyclicals Online
http://www.papalencyclicals.net/
Medieval Canon Law Virtual Library
http://web.colby.edu/canonlaw/tag/rufinus/
Corpus Thomisticum
http://www.corpusthomisticum.org/wintroen.html
Bibliotheca Ecclesiae Metropolitanae Strigoniensis
http://www.bibliotheca.hu/fugger/index.html
Jewish Virtual Library: Legislation Affecting the Jews (300-800 CE)
http://www.jewishvirtuallibrary.org/legislation-affecting-the-jews-300-800-ce
Diccionario Histórico de Derecho Canónico en Hispanoamérica y Filipinas (@ MPIeR, Frankfurt)
Library of Congress, Canon Law Collection
https://blogs.loc.gov/law/2011/03/the-law-librarys-canon-law-collection/?loclr=bloglaw
Bio-Bibliographical Guide to Medieval and Early Modern Jurists (Harvard)
https://amesfoundation.law.harvard.edu/BioBibCanonists/MainEntry_biobib2.php
Other Religious:
RELMIN (The Legal Status of Religious Minorities in the Euro-Mediterranean World (5th-15th centuries)
http://www.cn-telma.fr/relmin/recherche/
The Mishneh Torah
https://www.chabad.org/library/article_cdo/aid/682956/jewish/Mishneh-Torah.htm
The Babylonian Talmud
http://www.sacred-texts.com/jud/talmud.htm
RESEARCH TOOLS
Historical Dictionaries
Real Academia Española, Nuevo Tesoro Lexicográfico (Spanish)
http://www.rae.es/recursos/diccionarios/diccionarios-anteriores-1726-1992/nuevo-tesoro-lexicografico
Diccionario de Autoridades
Corpus Diacrónico del Español
https://corpus.rae.es/cordenet.html
Dictionnaires d'Autrefois (French)
http://dictionnaires.atilf.fr/dictionnaires/onelook.htm
Paleography Tools:
http://www.iifilologicas.unam.mx/dicabenovo/index.php?page=muestra-lista2a#.WKGr-vIvtVF
http://spanishpaleographytool.org/
BYU Script Tutorial
more coming soon!