As mentions in the "Home" tab, Cambridge Companions are available online through Cambridge Collections Online. Below is a list of some of the Companions that are available.
Academic Search Complete (dates vary)
Academic Search Complete is a comprehensive scholarly, multi-disciplinary full-text database, with more than 5,300 full-text periodicals, including 4,400 peer-reviewed journals. In addition to full text, this database offers indexing and abstracts for more than 9,300 journals and a total of 10,900 publications including monographs, reports, conference proceedings, etc. The database is updated daily and features PDF content going back as far as 1865, with the majority of full-text titles in native (searchable) PDF format. Searchable cited references are provided for nearly 1,000 journals.
JSTOR (dates vary)
JSTOR, the Journal Storage Project, provides access to digitized versions to complete runs of key scholarly journals in the arts, the humanities, literature, the sciences, the social sciences, and selected scholarly journals in related disciplines such as business, ecology, botany, music, and statistics. JSTOR represents the building blocks of a truly interdisciplinary scholarly journal archive.
An international bibliography that contains citations for Greek and Roman studies. The database covers all aspects of classical languages, literatures, history, philosophy, art, religion, music, mythology, science, numismatics, and other subjects. Its scope is the period from 2000 BC to 800 AD.
DIOTIMA: Materials for the Study of Women and Gender in the Ancient World
Diotima serves as an interdisciplinary resource for anyone interested in patterns of gender around the ancient Mediterranean and as a forum for collaboration among instructors who teach courses about women and gender in the ancient world. This site includes course materials, the beginnings of a systematic and searchable bibliography, and links to many on-line resources, including articles, book reviews, databases, and images.
DYABOLA: A Database of the Ancient World
Indexes books, journals, collected essays, and book reviews.It covers Greek, Roman, Cretan-Mycenean, Etruscan, Egyptian, and early Christian and Byzantine history, art, culture, and religion. To enter the database, please check the "with IP acess" box and then click the start button.
Bryn Mawr Classical Review
Bryn Mawr Classical Review (BMCR) publishes timely reviews of current scholarly work in the field of classical studies (including archaeology). This site is the authoritative archive of BMCR's publication, from 1990 to the present.