Beyond the books mentioned elsewhere in this thread, for Japanese, I think the Japan Times published books tend to be good, e.g. Seiichi Makino's grammar dictionaries.
It's more app- and website-oriented, but the Tofugu website has quasi-monthly roundups of new Japanese learning tools.
I feel like Chinese - for a variety of reasons - doesn't have the same high level of pedagogical curation. But the Fuller book is good for learning classical, and Pleco is a great platform for dictionaries, flashcards, etc -- some paid, some free.
It's more app- and website-oriented, but the Tofugu website has quasi-monthly roundups of new Japanese learning tools.
I feel like Chinese - for a variety of reasons - doesn't have the same high level of pedagogical curation. But the Fuller book is good for learning classical, and Pleco is a great platform for dictionaries, flashcards, etc -- some paid, some free.