Additionally, Eaglercraft supports both , multiplayer via custom Bungeecord proxies, and LAN worlds that can be shared across devices. This means many of the hacks you'd apply to a standard Minecraft server work on Eaglercraft too.
Moreover, since Eaglercraft is a single-player browser game often hosted on websites, the user might be hosting it themselves, in which case they can freely modify the files. If they're playing on a server, they might need to look into client mods instead of browser-based hacks. Hacks For Eaglercraft 1-5-2
In summary, the possible hacks would involve: Eaglercraft supports both