RABBINIC TEXTS:
Sefaria -a wonderful collection of traditional Jewish texts, many with English translations. Here you can find the text we are using for our study, Masekhet Berachot from the Bavli (Babylonian Talmud) with translation and notes by Rabbi Adin Steinsaltz https://www.sefaria.org/texts
The Soncino Translation of the Babylonian Talmud - For years this has been the standard translation of the Talmud into English. Since every translation is an interpretation, it is always worth looking at when trying to understand a passage. There are also good notes: https://halakhah.com/
DICTIONARY
Rabbi Marcus Jastrow's Dictionary of the Targumim, The Talmud Bavli and Yerushalmi, and the Midrashic Literature, the comprehensive and standard dictionary is available on line: https://www.tyndalearchive.com/TABS/Jastrow//
GENERAL INFORMATION:
My Jewish Learning - Lots of interesting articles on the Talmud, Talmudic topics, Talmudic Personalities, etc., as well as many other topics of Jewish religious, cultural, historical and social interest. https://www.myjewishlearning.com/
The Jewish Virtual Library is also a good place to go for additional information: https://www.jewishvirtuallibrary.org/
The Jewish Woman's Archive especially, The Shalvi / Hyman Encyclopedia of Jewish Woman provides in-depth information on women and woman's issues in every period of Jewish history. https://jwa.org/encyclopedia
The Hebrew Union College's Free On-Line Resources is a great place to go to get solid and accessible information on all sorts of Jewish topics. I particularly appreciate the links it provides to reliable websites. https://huc.edu/research/libraries/free-online-resources. For our class, I suggest looking at the section about Rabbinic Writings (https://huc.edu/research/libraries/free-online-resources/rabbinic-writings-and-talmud). If you are interested in serious research, the HUC site can link you to https://www.rabbinics.org/ where you will find many links to primary texts and scholarly articles pertaining to the 2nd Temple and Rabbinic Periods of Jewish history.
Don't forget Wikipedia. It is always a good place to start.
RESOURCES FOR LEARNING GEMARA
Learning Vocabulary:
https://marbitz.com/gemara-game/ - this is an online quiz program that reviews about 270 basic words. The Marbitz site also contains a set of interesting essays on selected midrashim. While the approach is Orthodox and apologetic, it is still very interesting.