Hello, there was an ICO a few months ago but it could not raise the enough funds so we can list the coin on popular exchanges. As the project was serious so we are thinking to start from open source exchanges like etherdelta & then list the token on bigger exchanges. I want to know that how many exchanges are there those are open source?
Did you research yourself any exchanges that suit your needs? Did you come up with something? You never even mentioned what "type" of coin your ICO is all about

That's really important in terms of what exchange your coin can even be "listed" on. So having as little information as you provided, people will mention those exchanges that you could've googled yourself in 10 secs which in turn probably won't help you that much.