Use the included Server.zip file from the Eaglercraft 1.21 download.
to unblocked platforms. While official versions of Eaglercraft were traditionally limited to 1.5.2 and 1.8.8, recent community ports (often using TeaVM) have successfully brought the "Tricky Trials" experience to school-safe environments. Key Features of Eaglercraft 1.21 The Breeze & Wind Charges eaglercraft unblocked 1.21
: The most widely used stable release with features like voice chat. : An evolving beta port by community developers. 1.21 (Experimental) Use the included Server