Macromedia Central. Still in beta, available for download here:
Macromedia has recently released a public beta of Central’s Software Development Kit (SDK) which can be found here:
other relative links:
SDK feedback http://www.macromedia.com/go/central_feedback
central mailing list http://www.macromedia.com/go/central_maillist
Mike Chambers of Macromedia has put together a Quickstart guide for the SDK which can be found at his blog here:
Also, some new Central community sites have surfaced:
Worth taking a look. Content may be skimpy now, but is sure to pick up once the ball gets rolling for Central, especially now that the SDK has been released.