Sketch is a vector-based illustration computer program for various UNIX platforms. It is written in C and uses the GTK+ libraries to provide object and GUI services.
Sketch is open source and licenced under the GNU Library General Public Licence (LGPL).
... vom subjektiven Geist (1837; 3rd ed., 1863)
Kritische Erläuterungen des Hegelschen Systems (1840)
Vorlesungen über Schelling (1842)
System der Wissenschaft ...