Bugloo is a source level debugger for the Scheme compiler Bigloo. It aims at helping to debug Bigloo programs compiled into JVM bytecode. It is implemented by means of the JVM Debugging Architecture, a set of standard APIs provided by Sun to make debuggers and profilers. Currently, Bugloo can debug Bigloo programs, Java programs, or a mix of both. It is based on the debugging model used in GDB and provides additional features like debug sessions, traces, memory debugging, programmable breakpoints and embeddable interpreters. It is a command-line debugger. For the sake of simplicity, it includes a graphical user environment for GNU Emacs or XEmacs.