Secure Nodes  ->
https://zencash.com/securenodes/
Securenode calculator
https://zen.lebre.net/  -  soon this percentage will be changed in to the 10%! Please read white paper.


Super Nodes ->
https://blog.zencash.com/zencash-super-nodes-new-white-paper/
https://zencash.com/assets/files/Zen-Application-Platform-Whitepaper.pdf
Supernode calculator
http://supernodes.lebre.net/

Check this post also!
https://bitcointalk.org/index.php?topic=2047435.msg36367143#msg36367143