The complete Soncino English translation of the Talmud: Halakhah.com
The Soncino Press Babylonian Talmud is comprised of 30 masterfully organized volumes. This set has been a valuable resource for the study of Talmud for more than 50 years. It offers an easy-to-use format–with the original Vilna Talmud page opposite its English translation–and many explanatory notes.
(I assume that this website is not a violation of Soncino’s copyright. I am not aware of their voicing any objection to it.)