You probably know that when making a mcpe aternos server there is only 2 software versions to choose from. Vanilla and PocketMine-MP. Comparing to the amount that java has this is little so Im here to suggest some server softwares for aternos mcpe servers. There is a website showing all minecraft bedrock edition server software. https://minecraft.gamepedia.co…k_Edition_server_software . In a thread posted in Announcments I saw an argument going over about 'Nukkit' and if it is discontinued or not. The website says that the developers have moved to NukkitX. Im not sure if this is much help but it is true only being stuck with PMMP and vanila. There are some discontinued ones. To not waste your time going on the website here are all the software listed.
-Jukebox
-NukkitX
-Foxel
-Cathy-Batcat
-MiNET
-Steasfast2
-SteadFast3
-Altay
-GoMint
-MCPELauncher
Hope you take into account some of these software and to see the links just go on the website https://minecraft.gamepedia.co…k_Edition_server_software