The file daily_team_summary.txt holds the full list of teams participating in Folding@Home.
It is updated every 3 hours.
It used to be once evey 6 hours, see:
Folding-community: Vijay Pande in "daily_*_summary.txt files empty or corrupted"
The file contains the team ID, team name, total score and number of completed work units.
How the file is structured can be seen below, where the first 10 lines of the file are shown.
Tue Aug 30 12:00:00 PDT 2005 team teamname score wu 0 Default (includes all those WU returned without valid team number) 435567935 7732901 446 Google 359611292 4925020 24 Overclockers Australia 172340356 2926405 33 [H]ardOCP 170878589 3109006 32 www.overclockers.com 133801031 2442792 51 Alliance Francophone 97147909 1386740 3074 2CPU.com Folding@Home 80428231 998060 64 Team Rage3D 77611925 1130791
Line 1 has the timestamp on which the file was generated.
Line 2 has a tab separated list of key names for the values on line 3 and below.
Line 3 and line 4 have a tab separated list of values for the names on line 2, both of the teams listed there are Aggregate Teams.
Line 5 until the end of the file has a tab separated list of values for the names on line 2, one line for each normal team.