ESAP comes out every year and is the gold standard review bank, though for the years you're actually in fellowship it might not be worth as much: It's the 90 ITE questions from that year plus only 30 new ones. As a fellow, we got the ITE questions+explanations back, so I didn't bother buying the qbank for 2017.
AACE comes out with ASAP for another qbank every five years or so. I hadn't heard much about it, but it just came out again last month and it was only like $125 as a fellow member, so I bought it. Unlike ESAP (120 questions a year), it's 300-something questions. I haven't used it yet.
Endocrine university is a conference every year for graduating fellows that I think 90% of people go to in March. I'll be there in a couple weeks. Have heard good things.
I've also heard good things about EBR, the cleveland clinic board review, and there's one in Boston as well every year I haven't heard too much about.
I own a copy of Endocrine Secrets but have never actually read any of it. I also own a copy of Williams textbook and have attempted to crack it open once (and fell asleep soon thereafter).