If you want to dig into the oldest and most important manuscripts we have of the biblical text, look no further than the Catholic Bible Student sidebar. I just added a link to a facsimile edition of the Aleppo Codex, one of the most ancient and authoritative Hebrew manuscripts of the Old Testament. The website has very sleek functionality and high-resolution zoom. Unfortunately, the other most important Hebrew manuscript, the Leningrad Codex, is not available online yet. At least, not in facsimile form. But you can find a link to its text at this amazing website from Tyndale House. They’ve done a wonderful job pulling together the best Bible resources on the web and are making them freely available. You can find links to the most important manuscripts, papyri and critical editions, tons of English versions, help with original languages. It’s a gold mine!