Many information about Ultimate, DiscGolf, Freestyle and other frisbee activities you can find also here:

SLOVAKIA:

Slovak Frisbee Association (SAF)

Disc Golf Slovakia
Mental Discorders, Ultimate team, Bratislava
Outsiterz, Ultimate team, Bratislava
Golden Ants, Ultimate team, Zlate Moravce
Discredit, Ultimate team, Bratislava
Scorpions, Ultimate team, Bratislava

Czech rep.:

Czech Flying Disc Association (CALD)
Disc Golf Czech
3SB, Ultimate team, Ceske Budejovice
Atrofovane Ruce, Ultimate team, Plzen
Rollnici, Ultimate team, Praha
Prague Devils, Ultimate team, Praha
Prazska Sedma, Ultimate team, Praha
Rektalni Vysetreni, Ultimate team, Brno
Terrible Monkeys, Ultimate team, Praha
Unikovy Vychod, Ultimate team, Usti n/L
Zluta Zimnice, Ultimate team, Plzen+Praha
Peace-Egg, Ultimate team, Pisek
Figurky Slonu, Ultimate team, Ricany

World:

European Flying Disc Federation (EFDF)
World Flying Disc Federation (WFDF)
Discraft USA
YiKunSports China
HeroDisc USA