The Israel Genealogy Research Association maintains an excellent genealogy site that's helpful for both Israeli and general Jewish genealogy.
The site is free to use but you do have to create an account with them before you can access their databases and resources. You will need to be a paid member to view some of the images in their collections.
Searchable database collections include vital records, censuses, address books, immigration, military records, and more. Searches can be done in both English and Hebrew. These record collections are primarily for Israel but you may be able to find records created in Jewish communities elsewhere. They are constantly adding new collections to their databases as well.
You can also watch free videos and webinars on a variety of genealogy topics.