| Rank | Name | Members | Recent average credit | Total credit | Country | Type |
|---|---|---|---|---|---|---|
| 1 | AMSAT |
412 | 629 | 523,615,631 | International | Non-profit organization |
| 2 | Boy Scouts of America |
50 | 541 | 43,311,352 | United States | Non-profit organization |
| 3 | TauZero |
314 | 410 | 226,631,614 | Chile | Non-profit organization |
| 4 | Portugal@Home |
2727 | 395 | 612,546,585 | Portugal | Non-profit organization |
| 5 | Universal Explorer |
87 | 174 | 219,341,669 | Finland | Non-profit organization |
| 6 | Freemasons |
102 | 153 | 101,136,852 | International | Non-profit organization |
| 7 | JAA |
39 | 137 | 106,986,744 | United States | Non-profit organization |
| 8 | refractionx |
1 | 115 | 1,812,789 | Bulgaria | Non-profit organization |
| 9 | MITRE |
71 | 110 | 78,386,966 | International | Non-profit organization |
| 10 | A.V.D.A. Vigevano |
33 | 108 | 32,800,170 | Italy | Non-profit organization |
| 11 | CIFNation |
6 | 105 | 6,781,180 | International | Non-profit organization |
| 12 | LCEAV (Le Ciel Est A Vous) |
16 | 104 | 32,370,518 | France | Non-profit organization |
| 13 | TWed2k |
100 | 100 | 41,171,367 | Taiwan | Non-profit organization |
| 14 | Les Clan des Investigateurs de l Inconnu (CII) |
4 | 83 | 4,949,208 | France | Non-profit organization |
| 15 | The Alien Seekers |
32 | 82 | 67,586,616 | United States | Non-profit organization |
| 16 | PARANORMAL SETI |
252 | 82 | 64,759,322 | United Kingdom | Non-profit organization |
| 17 | Toe Tags & Body Bags |
8 | 80 | 46,940,180 | United States | Non-profit organization |
| 18 | Blitzkrieg Whores 18+ |
1 | 78 | 5,195,826 | International | Non-profit organization |
| 19 | The Zeitgeist Movement |
481 | 76 | 134,449,857 | International | Non-profit organization |
| 20 | CERN |
329 | 68 | 60,997,896 | Switzerland | Non-profit organization |
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SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.