The server part of Telegram is closed source, but they've promised to open source it when it's ready. The API/protocol is open, existing clients are open, the server side is promised to be open in near future. I don't think Telegram scores badly in terms of openness. What they're not planning is an infrastructure of independent servers though.
But it's not federated. So even if the open up server's code you still need to trust them for running the code they release and to hold the complete social graph of the whole network. Not very aligned with our values.
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