Dowload PDFs of some amazing books:

In-depth discussions in English.
GUARDING_THE_EYES-E.pdf

44-page book in Hebrew, compiling sources:
SCHAR_ONESH_SHEMIRAT_ENAIM-H.pdf

TIKKUN_HABRIT_BERESHIT-H.pdf 419-page book in Hebrew!
ginzay-hamelech.pdf From R Yaakov Abuchatzeira's book Ginzei Hamelech.
kedushas-habris.pdf - By the author of Chak L'Yisrael, for the days of Shovevim .
rashbi-bris2.pdf Another Hebrew book for download.
TIKKUN48-H.pdf-  kabbalistic incantations by the Ar'i Hakadosh. If ou don't know how to use this, don't try.

Sources in English, compiled by an anonymous Tzaddik.
 GUARDING_BRIT-E.pdf