- GtkSourceGutter — Gutter object for GtkSourceView
- GtkSourceGutterRenderer — Gutter cell renderer
- GtkSourceGutterRendererPixbuf — Renders a pixbuf in the gutter
- GtkSourceGutterRendererText — Renders text in the gutter
- GtkSourceMark — Mark object for GtkSourceBuffer
- GtkSourceMarkAttributes — The source mark attributes object