Tomboy.

About Tomboy

Tomboy is a free and open-source desktop note-taking application written for Microsoft Windows, macOS, Linux, and BSD operating systems. Tomboy was part of the GNOME 2 desktop environment. Its interface is a word processor with a wiki-like linking system to connect notes together. Words in the note body that match existing note titles become hyperlinks automatically, making it simple to construct a personal wiki. For example, repeated references to favorite artists would be automatically highlighted in notes containing their names. As of version 1.6 (2010), it supports text entries and hyperlinks to the World Wide Web, but not graphic image linking or embedding.