There are many crypto exchanges but obviously if you are planning to do an ICO you need to list your tokens somewhere.
Coss.io is a relatively small crypto currency exchange when compared to the larger crypto exchanges. The exchange is based in Singapore and is still relatively young having only started in the past year at the time of writing this.
The exchange also has its own token called the COSS token. The token has value due to the fact that half of all the transaction fees are paid out as a dividend.
The good thing about the COSS platform is that it will list new tokens and is always looking for interesting tokens that can attract customers due to the offers that COSS can offer them.
In order to get your token listed will probably require the team to build a direct relationship with the team and offer COSS a good deal for their users.