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Because the backend is a standard Spigot server, you can use almost any plugin designed for 1.8.8. However, due to the WebSocket translation, some plugins behave differently. Here are the best-performing plugins for Eaglercraft 1.8.8 servers: Eaglercraft 1.8.8 Servers -
Warning: Avoid plugins that rely on native TCP socket binding (like custom voice chat mods). Also, avoid heavy map rendering plugins (like Dynmap) as they will consume your proxy’s bandwidth. Headline: Because the backend is a standard Spigot
Standard Minecraft uses TCP (Transmission Control Protocol) for reliable packet sending. Eaglercraft uses WebSockets (WS or WSS). However, thanks to the EaglercraftBridge and RemoteConnect protocols, an Eaglercraft client can communicate with a vanilla Java server via a WebSocket-to-TCP proxy. Warning: Avoid plugins that rely on native TCP
Here is the architecture of a typical Eaglercraft 1.8.8 Server:
The Result: Users on Chromebooks, iPads (with browsers that support keyboard/mouse), and locked workplace PCs can play alongside users on expensive gaming rigs running the native launcher.