What is Sponge?
The purpose of the Sponge project is to create a plugin development framework for Minecraft. Sponge is being created by a global community, and its open-source nature means anyone can participate.
Sponge has been built from the ground up to enrich your Minecraft experience by allowing plugins to add functionality to Minecraft.
Most plugins developed with the Sponge API should work across several different versions of Minecraft without needing to be updated.
Comments and Reviews
Said about Sponge as an alternative
it is open source it runs on Linux you host it can run on windows mac it has a bunch of plugins and it has a great community