Tomboy is a free and open source desktop notetaking application written for Unix-like (including Mac OS X) and Microsoft Windows systems written in C# using Gtk#. Tomboy is part of the GNOME desktop environment, often for personal information management. Its interface is a notepad with a Wiki-like linking system to connect notes together. Words in the note body that match existing note titles automatically become hyperlinks, making it simple to construct a personal wiki. For example, repeated references to favorite artists would automatically be highlighted in notes containing their names.