PocketMine-MP is essentially the Bukkit of Minecraft Pocket Edition. It's a free server software that allows anyone with a computer and port forwarding to create a Pocket Edition server accessible from anywhere in the world. And did we mention it's library of plugins? PocketMine also hosts PocketMine Realms, a list of PocketMine servers that can be joined through Minecraft Pocket Edition with no mods (seen above).
PocketMine announced yesterday, "We have hit 50.000 players on PocketMine Realms!" We love PocketMine and are very happy for them to reach 50K players worldwide. You can see the original tweet in the source link below, and don't be surprised to run into us on PocketMine Realms.