Just in pro era of international teams (I'll only include players with 10 or more tests). This took my like, 3 hours. And I was only vaguely interested in the first place...but anyway I think its reasonably comprehensive - the stats are from scrum.com, the brackets are the number of tests as captain. If someone finds a link which pretty much is just this, be kind and never let me find it. Certains countries like Russia, Spain etc just didn't seem to have any information.
Prop: Joao Correia (POR, 30), Peter Fatialofa (SAM, 16) Paul Vickery (Eng, 15), Deacon Manu (FIJI, 13), Dai Young (WAL, 12), Levan Tsabadze (GEO, 12)
Hooker: John Smit (SA, 83), Sean Fitzpatrick (NZ, 51), Raphael Ibanez (FRA, 42) Keith Wood (IRE, 36), Greg Smith (FIJI, 30),Patrick Riordan (CAN, 23), Massimo Cuttitta (ITA, 22), Jonathan Humphries (WAL, 19), Alessandro Moscardi (ITA, 19), Masahiro Kunda (JAP, 14), Mahonri Schwalger (SAM, 13) Tom Billups (USA ,12) Gordon Bulloch (SCO, 11), Dimitri Oboladze (GEO, 11), Marius Tincu (ROM, 10), Phil Kearns (AUS, 10), Anton Oliver (NZ, 10)
Lock: John Eales (AUS, 55), Fabien Pelous (FRA, 42), Raphael Ibanez (FRA, 41), Martin Johnson (Eng, 39), Marco Bortolami (ITA, 38), Sorin Socol (ROM, 36), Ilia Zedginidze (GEO, 32), Steve Borthwick (Eng, 21), Pedro Sporleder (ARG, 20), Victor Matfield (SA, 17), Mario Lame (URU, 16), James Horwill (AUS, 13), Mihai Macovei (ROM, 12), Zurab Mtchedlishvili (GEO, 12), Inoke Afeaki (TON, 12), Nathan Sharpe (AUS, 10), Todd Blackadder (NZ, 10), Abdelatif Benazzi (FRA, 10), Alastair Kellock (10), Paddy Johns (IRE, 10)
Loose Forwards: Richie McCaw (NZ, 82), Sergio Parisse (ITA, 50), Takuro Miuchi (JAP, 45), Semo Sititi (SAM, 39), Thierry Dusautoir (FRA, 38), Massimo Giovanelli (ITA, 37), Gary Teichmann (SA, 36), Takashi Kikutani (JAP, 34), Todd Clever (USA, 32), Ryan Jones (WAL, 32), Francois Pienaar (SA, 29), Dave Hodges (USA, 28), Nili Latu (TON, 25), Alan Charron (CAN, 25) Dan Lyle (USA, 24), Rocky Elsom (AUS, 24), Reuben Thorne (NZ, 23), Pat Lam (SAM, 23), Taine Randell (NZ, 22), Lawrence Dallaglio (Eng, 22), Collin Charvis (WAL, 22), Sam Warburton (WAL, 20) Jason White (19) Corne Krige (SA, 18), Juan Martin Fernandez Lobbe (17), Kort Schubert (USA, 17) Martin Corry (Eng, 17), Andre Vos (SA, 16), Chris Robshaw (Eng, 16), Rob Wainright (SCO, 16), Vasco Sousa Uva (POR, 16) Tiberiu Brinza (13), Bob Skinstad (SA, 12), Lewis Moody (Eng, 11), Aaron Carpenter (CAN, 11), Alifereti Doviverata (Fiji, 11), Ifereimi Tawake (FIJI, 10)
Halfback: George Gregan (AUS, 59), Irakli Abuseridze (GEO, 31), Agustin Pichot (ARG, 30), Fabien Galthie (25), Alessandro Troncon (22), Rob Howley (WAL, 22), Brian Redpath (SCO, 21), Mosese Rauluni (FIJI, 17), Michael Bradley (IRE, 15), John Graf (CAN, 15), Morgan Williams (CAN, 15), Gary Armstrong (SCO, 14), Mike Blair (SCO, 14), Joost van der Westhuizen (FRA, 10)
Fly Half: Lisandro Arbizu (ARG, 48)
Centres: Brian O'Driscoll (IRE, 83), Will Carling (Eng, 59) Stirling Mortlock (AUS, 29), Felipe Contepomi (ARG, 25), Tana Umaga (NZ, 21), Jean de Villiers (SA, 18), Romeo Gontineac (ROM, 14), Sebastian Salvat (ARG, 13), Yukio Motok (JAP, 12), Andrew McCormick (JAP, 10),
Outside Backs: Gareth Rees (CAN, 25), Gareth Thomas (WAL, 21), Gavin Hastings (SCO, 20), Chris Patterson (SCO (13), Toshiaki Hirose (JAP, 14)