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Yes, or simply to an index page over all of them.

Would these technically be competitors?

Steem.io is supossed to be about the Steem blockchain not Steemit.com. In that context they are not competitors. There should be a list of all the major apps conecting to the blockchain divided in categories (e.g. social media sites, wallets, tools, etc)

That depends on their particular reveneu/investment/'charity' model. I think currently some of them are, to a certain degree, competing.

Theoretically, although I don't want to imply that this is necessarily the case, Steemit inc (whom I suppose controll the Steem.io site) could of course deny listing any apps that they think could be hurting their bottom line. At this point in time however , I have a hard time seeing why they would.

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