For exchanges, we could try
Bitsquare (a descentralized exchange). It should be easy (and free) to get added
Feel free to make a request:
https://forum.bitsquare.io/t/how-to-add-your-favorite-altcoinSlimcoin sounds like a really cool project, would love to see it gaining more traction!
but they remove coins with no trading activity.
No worry, we are not that strict yet :-)
Br,
Manfred (founder of Bitsquare)