TYNDALE TECH, by David Instone-Brewer, has a new online rabbinics resource up: www. RabbinicTraditions.com Legal Texts before 500 CE in Mishnah, Tosephta, Babylonian & Jerusalem Talmuds.
He also has links to other rabbinics resources, including his new online book, at Rabbinic Texts to Read and Search. Most of these cost money to use properly.