MSWLogo is an interpreter language based on Logo, with a GUI front end. Its core is the same as UCBLogo by Brian Harvey. It is free software, with source available, in Borland C++. MSWLogo supports multiple turtles, and 3D Graphics. MSWLogo allows input from COM ports and LPT ports. MSWLogo also supports a windows interface thus I/O is available through this GUI- and keyboard and mouse events can trigger interrupts. Simple GIF animations may also be produced on MSWLogo version 6.5 with the gifsave command.