Some of these ofcourse had chance to play in NHL, but did decide not to do it...
Well I guess the best goalies has been Percy LeSueur, Paddy Moran, Riley Hern, Jiri Holecek, Vladislav Tretiak and Vladimir Dzurilla.
If I think other goalies from early 1900 I would say Eddie Giroux, Jack Winchester, Billy Nicholson and ofcourse Bouse Hutton who is kind of hard to get read.
Charlie Reid was rather highly regarded amateur in Alberta in 1910´s. Went PCHA development league.. became best goalie of Big Four and one time WCHL all-star and Stanley Cup Finalist. Red McCusker was another quite highly regarded WCHL/WHL goalie who never played in NHL.
Canada´s 1920 olympic goalie Wally Byron was higly regarded.
Vern Turner and Ray Bonney (1920 USA Olympic goalie, Ottawa product) had quite strong competition in USAHA/AHA in 1920´s. Both highly regarded and especially Turner had really hard competition in league (early career Tiny Thompson, Roy Worters, Chuck Gardiner... and many other strong goalies like Flat Walsh, Joe Miller, Frenchy Lacroix, Red McCusker, Hal Winkler...)
Jimmy Foster went to Britain and even represented England in WHC. Maroons and Maple Leafs were atleast after him in 30´s.
And then there is ofcourse the strong/depth goalies in CSSR like Jiri Kralik, Vladimir Nadrchal, Marcel Sakac...
And some of the best Finnish and Swedish goalies like Urpo Ylönen, Jorma Valtonen, Leif Holmqvist and Pekka Lindmark...
Soviet goalies like Viktor Konovalenko etc....
I could go to my notes and list many more..