Open to public but it is a private tracker torrent and direct download forum:
Team-OS - www.teamos-hkrg.com
Always welcomes new people, but one account per home IP, they will ban second accounts and they will warn you.
Staff are fair and firm. Support is always given there 24/7.
VIP releases are only available to paid VIP Members, but there is a lot of other free variety of operating systems that some are even better.
The tracker is always open.
Rules are detailed, with screen shots etc and its a fun site to be on.