There is not a single exchange source that list coins or tokens for free without any fee ,bitforex ,okex or huobi are very good exchanges for altcoins but they aren't free either
If you know binance then I think you will change that mind. Binance has started to free listing fees as long as the project is good and has a large and solid community. Indeed, almost all exchangers charge listing fees for each listing token but there are some that do not charge listing fees because of several factors and one of them is binance