One of my favorite Judaic references tools is ASPAKLARIA אספקלריא, a Hebrew encyclopedia of Jewish thought. Each entry give fulls texts of the sources in the Bible and in Rabbinic texts, medieval Jewish philosophy and Nahmanides and Zohar followed by the topic in Maharal, Hasidut, Musar, and Rav Kook. The topic index goes way beyond the obvious entries.
The full title is ASPAKLARIA Compendium of Jewish thought – editor Shmuel Avraham Adler.
It may still be in beta because it does not look finished and because I did not find any Hebrew announcements that it is online.
Enjoy
אספקלריא קובץ אנציקלופדי למחשבת היהדות
Hebrew alphabetical index is in top right corner
The Book of Doctrines and Opinions: 