The purpose of this thread is to build a list of and discuss existing and upcoming zero-fee coins that focus on being a day to day currency (so not tokens which act as funding for some niche project).
I only have two on my list so far:
1) IOTA (IOTA)
2) Raiblocks (XRB)
Leave any others that I missed in the comments and I will update as we go.
The big question right now is why doesn't everybody uses these two coins if the fees are 0? Not enough marketing or not enough spread among exchanges?