Brill's Companions to Late Antiquity and Medieval Studies Online is an expanding e-book collection of specially commissioned research companions covering the Byzantine and medieval periods. Peer reviewed and written by experts, these handbooks offer balanced accounts at an advanced level, along with an overview of the state of scholarship and a synthesis of debate, pointing the way for future research. Designed for students and scholars, the books explain what sources there are, what methodologies and approaches are appropriate in dealing with them, what issues arise and how they have been treated, and what room there is for disagreement. All volumes are in English.

Basilica Online is a fully-searchable online edition of the 17 volumes of the Basilica text and its scholia, as edited between 1945 and 1988 by H.J. Scheltema, D. Holwerda, and N. van der Wal. The Basilica is the single-most important source for Byzantine law throughout the period of the Byzantine empire, and is a major source for Byzantine studies more broadly.

Byzantina Australiensia Online is the online edition of the first 20 volumes of the series Byzantina Australiensia a refereed academic series dedicated to publishing high quality scholarly work in the field of Byzantine Studies. Its primary focus is translations and commentaries of ancient source material, as well as the publication of conference papers. The volumes were originally published between 1981 and 2014 by the Australian Association for Byzantine Studies.

New volumes in the series will be part of the European History and Culture 1 E-Book Collection.

The Byzantinische Bibliographie Online includes the bibliographic sections of the Byzantinische Zeitschrift from volume 98 (2005) up to the present day. It contains around 30,000 entries in total, and each year about 4,000 entries will be added. The entries are organized systematically by subject area and enriched by short discussions and references to relevant review articles.

Brill’s Humanities and Social Sciences E-Book Collections are available on Brill Online with all the advantages and features of digital publishing.The Brill E-Book package can be purchased as a whole, but is also divided into seven broad subject categories that are offered separately.