Open Watcom is a joint effort between SciTech Software, Sybase, and the Open Source development community to maintain and enhance the Sybase Watcom C/C++ compiler products. The core tools in the package permit cross-platform development that allows developers to exploit the advanced features of 32-bit operating systems, including Win32, OS/2 and Linux. The multi-platform debugger advances developer productivity. Features include ability to set breakpoints on nested function calls, improved C++ and DLL debugging, reverse execution and configurable interface. Open Watcom C/C++ includes container and stream class libraries. An Open Watcom specific STL implementation is in progress, and based on this work a subset of STL is supported.