openDesktop.org :
Multiplatform GTK text editor. It features:
Configurable syntax highlighting.
Configurable keyboard accelerators.
Multiplatform - works both on unix and windows.
Plugins: can be written in C or Python.
Configurable tools available from the main and context menus. They can be written in Python, Lua, or it can be a shell script.
Regular expression search/replace, grep and find frontends, builtin file selector, etc.
