Anki has become the de-facto standard for memorizing the large swaths of information required during medical school. Not everyone uses it, but pretty much everyone that does and sticks to it sees impressive results.
It's interesting to note in studies comparing spaced repetition vs. massed learning, when students are asked afterward which method works better, they more often choose massed even though their own test results favor spaced repetition[0]. The upshot is people can use spaced repetition, it can "work" (in the sense that they remember the material better and test better) yet still drop it thinking massed practice to be superior.
