STLport is a multiplatform C++ Standard Library implementation. It is a free, open-source product, featuring the following:
Standard (ISO/IEC 14882) compliance;
Advanced techniques and optimizations for maximum efficiency;
Exception safety and thread safety;
Important extensions---hash tables, singly-linked list, rope;
Power debug mode---run time check of the correctness of iterators and containers usage.
STLport works on any platform possible and proves itself as a seamless drop-in for modern production environments. Not only that---it also offers important functionality not provided by any other standard library vendor:
Debug mode: "Safe iterators" and preconditions with rigorous runtime validity checking;