I was looking for other currencies that does work like iota under the mechanism of DAG (Directed Acyclic Graph) do you know any of them?

Im looking forward to invest in (Directed Acyclic Graph) Dag-based coins or even an ICO , which ones are your favorite and whats a good exchange you can trade btc or other blockchain cryptos for them?

I only heard about iota? What else do you know? Cant find a list of these dag-based

Thanks in advance