CedaryCat 

An additional IL patch layered on top of OTAPI, enabling multiple Terraria server instances to run concurrently within a single process.

a efficient terraria packet serializer.

On the basis of OTAPI, by pulling out the common types to achieve friendly compatibility with the protocol library

An experiment-friendly Terraria server launcher based on OTAPI USP, hosting multiple worlds in a single process with per-instance consoles, a release assistant, and plugin scaffolding