Surely, you can split them by 'complete' and 'not complete', but the definition of 'complete' is a tough one.
Timewarp, for example, is very playable, but by definition of the makers it was not complete, since they wanted to add a story mode to it. Nevertheless, I think it's good if the visitors could see what effort went into it and have fun with playing it for themselves.
Perhaps it's better to just list these mods and clones, provide a link to them and a short description, and mention whether they have been discontinued or that there's still being worked on.
Not listing them at all is not fair to all the time and effort that went into those, even if they weren't continued, since after all they were trying to create something fun for the SC community to play.