If you are into privacy related coins, keep an eye on SUMO. They are around since 2017 and made some good progress over the last year. Good guys, nothing could stop them so far 
I checked their github repository and the team appears to be hard at work. I'm impressed with what I've seen so far. For the records, it's the first time I'm hearing about SUMO. I just think that they need a little more work on their marketing department to bring the project to the limelight. Their github commit history is healthy. They should try to get listed on some mid to high tier exchanges.