Code Medic provides access to the power of gdb with an intuitive front end. It currently supports opening multiple source windows at once, setting/clearing breakpoints while the program is running, watching variables change in the variable tree as you step through code (even with nested structs), text searching through source, and integration with Code Crusader to provide a rapid, efficient develop-debug cycle.
Petite Chez Scheme is a freely distributable interpreted version of Chez Scheme, a high-performance implementation of ANSI Scheme with numerous extensions. Petite Chez Scheme may be used as a run-time environment for compiled Chez Scheme applications or as a stand-alone Scheme system. With the exception that the compiler is not present, Petite Chez Scheme is completely compatible with Chez Scheme.