There isn't a lsit that I'm aware of, some members will probably know and post the clauses for some of the bigger players.
Every player in Spain has to have a release clause by law and a lot of youngsters in South America have reasonable clauses to help attract European clubs to bid for them, so have a look in those nations and you may find some nice surprises.
---------- Post added at 08:33 PM ---------- Previous post was at 08:32 PM ----------