admin_execall <command>: Force every player to execute a command locally (limited).
admin_execclient <target> <command>: Force specified player to execute local command.
admin_execteam <team> <command>: Force everyone on team to execute local command.
admin_fraglimit <fraglimit>: Sets the server's mp_fraglimit cvar.
admin_friendlyfire <on | off>: Sets the server's mp_friendlyfire cvar.
admin_fun <on | 1 | off | 0>: Turns fun mode on (1) or off (0), allowing a variety of other commands to be used on the server.
admin_gag <target> [<minutes>]: Gag the specified target for the specified number of minutes. Specifying 0 minutes results in a permanent gag. (see admin_ungag)
admin_glow <color | "off">: Causes you to glow that color. Requires fun mode.
admin_godmode <target> <"on" | "off">: Sets godmode on target.
admin_gravity <gravity>: Sets the sv_gravity cvar.
admin_hostname <name>: Sets the hostname cvar.
admin_kick <target> [<reason>]: Kicks target.
admin_listmaps: Shows maps in mapcycle.
admin_listspawn: Lists all spawned entities.
admin_llama <target>: Llama-fy target. Changes name to Llama and makes them speak in a new language.
admin_map <map_name>: Changes map without disconnecting players, same as using changelevel via rcon on a server.
admin_messagemode <command>: Will treat things you 'say' as command.