Xonotic is a opensource first-person shooter, which was forked from Nexutiz, which was based on quake.
Installation
Installation is easy and doesn't need much hardware power nor packages.
$ doas pkg_add xonotic-server
Configuration
Copy server config to your home directory
$ cp /usr/local/share/examples/xonotic/server.cfg ~
You might want to change following parts:
If you want to hide your server from serverlist
sv_public 0
If you want to set a name for your server
hostname yetanotherxonoticserver
If you want to set a maximum number of players for this server
maxplayers 4
You can see more info and examples on configuration of server at /usr/local/share/examples/xonotic/server.cfg.
Running
$ xonotic-dedicated +serverconfig ~/server.cfg
And it has started. voila!