Wikipedia
MSWLogo is an interpreted language based on Logo, with a GUI front end. It was developed by George Mills at MIT. 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. The program is also used for educational purposes. Jim Muller wrote The Great Logo Adventure, a complete Logo manual using MSWLogo as the demonstration language.
MSWLogo has evolved into FMSLogo: An Educational Programming Environment, a free, open source implementation of the Logo programming language for Microsoft Windows. It is released under the GPL and is mainly developed and maintained by David Costanzo.