A simple list of online tools for PVP members to use:
Discord
Something Silly
PvP:
Master Duel - Android PC
YugiohPro PC
Dueling Book PC
Duel Links PC Android
Deck Building:
Yugioh Pro Deck Builder
If you Have anymore suggestion feel free to post them in this sticky!
Domino City! (Yu-Gi-Oh! Role-Play)
A table-top based role play!