- Allen and Greenough Latin Grammar from Perseus
- Alpheios - Firefox extensions for analyzing words in HTML and Unicode compliant Greek and Latin texts (including ones you yourself have created).
- Vinciator – Paste in any Greek or Latin text and Vinciator can dynamically link it to several online and offline morphological parsers and dictionaries.
- Corpus Grammaticorum Latinorum - Archive of late Latin grammatical sources.
- Liddell and Scott Greek English Lexicon
- Latin Dictionary & Grammar Aid
- Lewis & Short From Perseus
- Textkit - There are several good grammar texts, prose composition books, and readers available here for download: Smythe, Allen & Greenough, Bennett, etc.