Asia Major -- three generations of journals, with most articles
available for free online. The most recent one seems to focus mainly on
history and culture, while the first two also include many interesting
articles on classical Chinese. The oldest one is mainly in German.
- Sino-Platonic Papers --
a series of articles edited by Victor H. Mair, ranging from details of
grammar to poetry translations and historical topics. Many of these are
available for free online.
Bulletin of the Museum of Far Eastern Antiquities -- unfortunately
these are not available online, but many of Karlgren's works are published
here. The most important are available as reprints, sold by the museum.
- Chinese Text
Project -- many old Chinese texts, some of them with Legge's English
translation. Allows searching, and contains some cross-references.
Zuozhuan Digital Concordance
- China the
Beautiful -- various classical texts.
Gutenberg -- has a decent collection of old Chinese texts in digital
format. Maybe not as complete as one would wish, but enough to keep you
occupied for a while.
Garden of Stories
-- The University of Nanjing has this digital edition of the Garden of
Stories by Liu Xiang. These short anecdotes in a relatively developed and
simple version of the classical language are common in introductory
textbooks, and for a good reason.
- Zhongwen.com -- classical and modern
readings, with links to the author's dictionary (which is also published
as a book).
- Chinese Text
Initiative -- from the University of Virginia, there are digital
versions of several classical texts (and some modern), some of them with
translations, illustrations or scanned copies of older editions.
- Translations from the
Han Nom -- unicode CJK fonts including extensions A and B.