SEGS is the Super Entity Game Server. It is a free, open source (under the terms of the BSD License), cross-platform, and object-oriented suite of protocols and services.
SEGS is written in C++ and allows developers to write MMORPG clients with a focus on the superhero-theme. These clients can easily interface with SEGS' provided services. SEGS also facilitates common MMORPG functionality such as account and character storage to a database, account and character retrieval from a database, secure client authentication, client movement in a virtual world, and client chat.
SEGS currently runs under a variety of platforms including Windows, Linux, *BSD, and probably other UNIX derivatives.
SEGS also works under the x86-64/amd64 architecture.