There are other sweepstakes websites out there, but SweepsAdvantage and SweepstakesPlus are, IMHO, the best. I won't mention any other sites by name but I'll tell you how I arrived at this conclusion. Like many sweepstakes enthusiasts, when I started, I visited several different sites to see which ones I like best. Visiting multiple sites is also a good way to make sure you're not missing anything.
Although some other sites also have large databases of sweepstakes, SweepsAdvantage always seems to have the most new listings. On any given day, I know there will be at least 200 new sweepstakes listed, and sometimes it's substantially more than that. I don't need to look anywhere else because I am confident that if there is a sweepstakes out there, SweepsAdvantage has posted a link to it. You can depend on SA to always enter sweepstakes.
The site tools are also a big selling point. The leaner version of the site, SweepsAdvantage, allows you to create MySweeps lists, check off sweepstakes you have already entered, and pop open multiple entry forms at one. The cadillac model, SweepstakesPlus, has more advanced customizable tools, and no advertising. Gotta like that.
However, I think it is the community of sweepers at SweepsAdvantage that really sets the website apart. Sure, we're all competing for the same prizes, but the atmosphere at SweepsAdvantage is friendly and supportive. The members are great about sharing codes and entry tips so that more people can be lucky winners. The evidence is right on the front page with the constantly updating Winners Circle posts. When the members share their good news, other members are always quick to congratulate them for their sweepstakes win.