I like the ezQuake default /builtin script:

alias +axe "weapon 1;+attack"
alias -axe "-attack"
alias +gl "weapon 6 5 3 2 4 1;+attack"
alias -gl "-attack"
alias +lg "weapon 8 5 3 2 4 1;+attack"
alias -lg "-attack"
alias +ng "weapon 4 5 3 2 1;+attack"
alias -ng "-attack"
alias +rjump "weapon 7;+attack;+jump"
alias -rjump "-attack;-jump"
alias +rl "weapon 7 6 5 3 2 4 1;+attack"
alias -rl "-attack"
alias +sg "weapon 2 3 5 4 1;+attack"
alias -sg "-attack"
alias +sng "weapon 5 3 2 4 1;+attack"
alias -sng "-attack"
alias +ssg "weapon 3 2 5 4 1;+attack"
alias -ssg "-attack"
alias +zoom "set oldfov $fov;lowsenscalc;fov 80;wait;fov 70"
alias -zoom "normalsenscalc;fov 95;wait;fov $oldfov"

What would be the equivalent in Q3A? or CPMA/OSP?

// config map changes
set d1 "map q3ctf1; set nextmap vstr d2;"
set d2 "map q3ctf2; set nextmap vstr d3;"
set d3 "map q3ctf3; set nextmap vstr d1;"

// bind to keys
bind 1 "rcon vstr d1"
bind 2 "vstr d2"
bind 3 "vstr d3"

//from console you could also
vstr d1 // executes d1


Note: All the above assumes single player mode
If you are using the Q3 game client connected to a dedicated server, you would prefix the commands with 'rcon';

rcon set d1 "map q3ctf1; set nextmap vstr d2;"
rcon set d2 "map q3ctf2; set nextmap vstr d3;"
rcon set d3 "map q3ctf3; set nextmap vstr d1;"


bind 1 "rcon vstr d1"
bind 2 "rcon vstr d2"
bind 3 "rcon vstr d3"