http://www.truelearn.com/general-surgery/
this is true learn. I used it two years ago and had my worst year on the absite (disclosure, it was a 69th percentile). Nearly everyone in my program swears by it and gets much out of it, so it is probably worthwhile. It is priced similar to USMLEWorld (that is, like $99 for 1 month, $170 for 3 months, and like $300 for a year). The questions are very similar, well vetted with few typos, and definitely challenging. There is also an app that makes using it on the phone a breeze.
http://www.surgicalcore.org
this is SCORE. SCORE is a web portal maintained by the ACS. Almost every single residency in the US subscribes their residents to score, thus it is free for you to use. It is in theory written by the same people that write the ABSITE, and the curriculum for the ABSITE comes directly from SCORE. That being said, the questions in score are often poorly written, may have wrong answers (like, blantantly wrong or that the explanations are correct but the wrong answer selected), many questions in formats not used on the ABSITE (except questions namely). No native phone support but I used it on my phone all the time and did fine with it.
These are the only online qbanks that I am really aware of for the absite.
There are many other sources of questions, mainly in the form of books.
Amazon product ASIN 1416046909
People will refer to deVirgilio, which is the book listed above. I have it, I'm underwhelmed myself, but it is sworn upon, and I don't know if i gave it a fair shake (I used it more as a junior where it is more senior driven back when there was a junior and senior exam, now that there is only 1 exam it might be more useful).
Amazon product ASIN B01D44BAQ6
This is actually brand new, so unvetted. However, there is also the 8th and 9th edition available as kindle books (a reason I like it) and they actually have different questions so i don't feel stupid for having both editions. I like it, probably more than deVirgilio
Amazon product ASIN 1437717918
Rush review. Another one very commonly referred. Also another one I have (our residency gives us $450/year in book money... after buying an atlas and a text book, despite having online access to all textbooks and thus not having a real need to own one, I spent most of my money on absite review materials), and I like it, but in earlier years used schwartz more frequently because I have the hard copy of this and kindle version of the other, and with kindle on my phone and tablet, much easier to use them while on call or sitting around between cases etc. So this comes in kindle version and could serve the same purpose
Amazon product ASIN 0071546871
Not true question book, but for those that like quick one liners or what not (this book would make amazing flashcards for ankiweb btw), this book is awesome actually. Very high yield, I like it a lot, but haven't had time/effort/energy to use it in a few years.
My residency is trying to make an trivia crack type of app/database (there is an open source trivia crack where you can make your own qbanks for it and challenge your friends) where we are in the process of making questions but as soon as the attending who is in charge of it wants to bring it to the rest of the world I will post it on here and see if it can go larger.
There are obviously more things out there, but this is what I am most familiar with.
Also, the ultimate source for absite, Fiser's, is apparently coming out with a new edition (
Amazon product ASIN 1496336976) so I guess all the interns out there should hold off until August to purchase this...