Total of 17, or 18 if you count Levi. Stablinski never podiumed the Tour, although he won several stages. He also raced for the unusual "Poles living in France" team that featured in the Peace Race from 1949 to 1953.
1 - Adolf Christian (1962), 3rd in the 1957 Tour and, now Kohl has been demoted, the only Austrian to podium Le Tour;
2 - Gösta Pettersson (1962), 3rd in the 1970 Tour;
3 - Herman van Springel (1965), 2nd in the 1968 Tour;
4 - Vicente López Carril (1975), 3rd in the 1974 Tour;
5 - Johan van der Velde (1978), 3rd in the 1982 Tour, accidentally named Johannes by the race organisation;
6 - Peter Winnen (1980), 3rd in the 1983 Tour;
7 - Laurent Fignon (1981), winner of the 1983 and 1984 Tours and 2nd in the 1989 Tour;
8 - Piotr Ugrumov (1983, 1984, 1988, 1989), 2nd in the 1994 Tour and the first rider mentioned in this list to podium both races (3rd in the 1989 Friedensfahrt);
9 - Miguel Indurain (1984), winner of the 1991, 1992, 1993, 1994 and 1995 Tours;
10 - Erik Breukink (1985), 3rd at the 1990 Tour;
11 - Zenon Jaskuła (1986, 1987, 1988, 1989), 3rd in the 1993 Tour;
12 - Jan Ullrich (1994), winner of the 1997 Tour and 2nd in 1996, 1998, 2000, 2001 and 2003;
13 - Raimondas Rumšas (1994, 1997, 1998, 1999), 3rd in the 2002 Tour and the first man listed to have placed higher at the Friedensfahrt than at the Tour (2nd in the 1999 Peace Race);
14 - Bjarne Riis (1998), winner of the 1996 Tour and 3rd in 1995;
15 - Andreas Klöden (1998, 1999, 2000), 2nd in the 2004 and 2006 Tours;
[- Levi Leipheimer (1999), 3rd in the 2007 Tour;]
16 - Bobby Julich (2003), 3rd in the 1998 Tour;
17 - Fränk Schleck (2003), 3rd in the 2011 Tour.