andy@e-molecule.com writes:

I am currently using STLPort quite heavily in a large application. It runs on both linux, windows and sgi with good performance. It is threadsafe, in fact fully reentrant, and I'd say its quite indispensible for any serious work in C++.

I second that. I started working with STLport with the Sun WorkShop C++ 4.2 compiler in 1999 and very quickly concluded that STLport is an absolute necessity when working with a compiler whose ISO/IEC 14882:1998 Standard Containers Library and Standard Algorithms Library is deficient or absent.

(I've also had good results with the ObjectSpace C++<ToolKit>, but it is neither Free nor open-source.)