Boxscore Baseball is not a direct competitor as it is more like an amped up FantaSim, but I used to play when it started as a small proprietorship in NY decades ago...oh needless to say without a baseball season they are hosed.
Haven't played in decades...and in fact you used to send in your lineups and settings via mail (snail type) and receive your weekly results by snail mail as well. Best envelope ever. And the weighted draft results--that was a great envelope.
It is a sizable monetary commitment so it is not my thing, but there are aspects of it that were cool, like the weighted drafts, minor leagues etc.
http://www.boxscoresports.com/baseball/baseball.asp