QUR'AN AND HADITHS
I am not an expert on scriptures. However, like all scholars of Islam and indeed most practising Muslims, I need to refer back to these texts frequently. Here are my recommendations for online resources.
I recommend ALTAFSIR.COM if you are looking for the Qur'an in Arabic as well as an exhaustive and well-balanced online collection of Qur'anic commentary (tafsîr), translation, recitation and other excellent resources. Here's a quote from the website, explaining what it contains:
It was begun in 2001 by the Royal Aal al-Bayt Institute for Islamic Thought, Jordan. Today the website is fully operational in Arabic and English and provides the original Arabic texts of 150 or more books of Qur’anic Commentary, Interpretation and Explanation (tafsir or tafseer), recitation (tajwid) tutorials and hadith collections, and other fields, pertaining to the study of Qur’anic exegesis. Translations of the meanings of the Qur’an are currently available in 24 different languages, and in several cases more than one translation is available. The site also includes audio Qur’an recitations; resources on Qur’an syntax; resources on the Contexts of Revelation (asbâb al-nuzûl); resources on the meanings of words found in the Qur’an, and other works on the Qur’anic sciences. It contains over a million pages of Qur’anic Commentary and translation. Some of the texts presented here exist only as manuscripts and have never previously been published in book form despite their historical importance and influence. Altafsir.com is thus a complete website for the study of the Qur’anic Sciences.
In addition to presenting the standard Classical and Modern Commentaries on the Holy Qur’an (tafsir or tafseer) texts of all eight schools of jurisprudence, the site also contains works of various mystical, philosophical, linguistic and theological currents. Moreover, the first time in one place, comparative studies between the Shafi‘i, Hanafi, Maliki, Hanbali, Ja‘fari, Zaydi, Ibadi and Thahiri schools can be carried out complete with multi-screen displays and search programs.
I have had difficulty finding an online resource for hadiths as good as the one I recommend for the Qur'an. Websites such as Sunnah.com and HadithCollection.com present translations of many collections (Buhkari, Malik, Nawawi, Hadith Qudsi). They can serve as a starting point, but better print editions should be consulted for scholarly work. Since my work focuses on Sunni Islam, I am not as familiar with Shia sources.