What is the ruling on working as a programmer developing an online store that sells Talmudic tools and items to Jews, and is the money earned from this work permissible?

It is impermissible to assist those who propagate falsehoods, such as the beliefs and fabrications of the Jews, whether through programming or other means, because Allah, the Almighty, says: "And do not cooperate in sin and aggression." So, if you know that the client's purpose for the program is to use it for something unlawful, it is not permissible for you to create it for them. As for what you earned previously from downloading programs while you were unaware of its prohibition, there is no blame upon you for benefiting from it, because Allah, the Almighty, says: "So whoever receives an admonition from his Lord and desists, he may have what is past."