Jewish Buddhism. Obviously a big aspect of modern Buddhism given how many prominent leaders have been Jewish, although oddly my own guides into Buddhism have been mostly goyim.
I like to think that what Buddhism and Jewishness have in common is a kind of tendency towards outsiderness. Jews of course have been historic outsiders and exiles. Buddhism has a very different social history, but it promotes a sort of exile-from-being, or "dwelling nowhere" as The Philosophy of Zen Buddhism puts it.
Being Jewish – not the tough Israeli kind or leftist-warrior-for-justice kind, more like the comical, introspective, ironical kind – involves a certain comfortableness with being homeless. A familiarity with it, a rueful tendency to accept it.
The Zen view – similar in some ways, if less entertaining, less grandiose, less involving the construction of elaborate puzzles. Even more negative in some sense, more anti-, more against, even as it points in the opposite direction to opposition.