Verlihub - Direct Connect server

Verlihub is a Direct Connect protocol server that runs on Linux OS,
written in C++; Many features are available: MySQL database, very
low use of CPU, RAM & Bandwidth, deflood integrated protection,
plugins (LUA, forbidden, ip-log, funny, messenger & chatroom) and
MORE, MORE AND MORE...

If you don't want to run verlihub as root and still use port 411,
get the optional dependency authbind.

More info on website: http://www.verlihub-project.org