diff --git a/extra/4DNav/4DNav-docs.factor b/unmaintained/4DNav/4DNav-docs.factor
similarity index 100%
rename from extra/4DNav/4DNav-docs.factor
rename to unmaintained/4DNav/4DNav-docs.factor
diff --git a/extra/4DNav/4DNav.factor b/unmaintained/4DNav/4DNav.factor
similarity index 100%
rename from extra/4DNav/4DNav.factor
rename to unmaintained/4DNav/4DNav.factor
diff --git a/extra/4DNav/authors.txt b/unmaintained/4DNav/authors.txt
similarity index 100%
rename from extra/4DNav/authors.txt
rename to unmaintained/4DNav/authors.txt
diff --git a/extra/4DNav/camera/authors.txt b/unmaintained/4DNav/camera/authors.txt
similarity index 100%
rename from extra/4DNav/camera/authors.txt
rename to unmaintained/4DNav/camera/authors.txt
diff --git a/extra/4DNav/camera/camera-docs.factor b/unmaintained/4DNav/camera/camera-docs.factor
similarity index 100%
rename from extra/4DNav/camera/camera-docs.factor
rename to unmaintained/4DNav/camera/camera-docs.factor
diff --git a/extra/4DNav/camera/camera.factor b/unmaintained/4DNav/camera/camera.factor
similarity index 100%
rename from extra/4DNav/camera/camera.factor
rename to unmaintained/4DNav/camera/camera.factor
diff --git a/extra/4DNav/deep/deep-docs.factor b/unmaintained/4DNav/deep/deep-docs.factor
similarity index 100%
rename from extra/4DNav/deep/deep-docs.factor
rename to unmaintained/4DNav/deep/deep-docs.factor
diff --git a/extra/4DNav/deep/deep.factor b/unmaintained/4DNav/deep/deep.factor
similarity index 100%
rename from extra/4DNav/deep/deep.factor
rename to unmaintained/4DNav/deep/deep.factor
diff --git a/extra/4DNav/deploy.factor b/unmaintained/4DNav/deploy.factor
similarity index 100%
rename from extra/4DNav/deploy.factor
rename to unmaintained/4DNav/deploy.factor
diff --git a/extra/4DNav/file-chooser/authors.txt b/unmaintained/4DNav/file-chooser/authors.txt
similarity index 100%
rename from extra/4DNav/file-chooser/authors.txt
rename to unmaintained/4DNav/file-chooser/authors.txt
diff --git a/extra/4DNav/file-chooser/file-chooser.factor b/unmaintained/4DNav/file-chooser/file-chooser.factor
similarity index 100%
rename from extra/4DNav/file-chooser/file-chooser.factor
rename to unmaintained/4DNav/file-chooser/file-chooser.factor
diff --git a/extra/4DNav/hypercube.xml b/unmaintained/4DNav/hypercube.xml
similarity index 100%
rename from extra/4DNav/hypercube.xml
rename to unmaintained/4DNav/hypercube.xml
diff --git a/extra/4DNav/light_test.xml b/unmaintained/4DNav/light_test.xml
similarity index 100%
rename from extra/4DNav/light_test.xml
rename to unmaintained/4DNav/light_test.xml
diff --git a/extra/4DNav/multi solids.xml b/unmaintained/4DNav/multi solids.xml
similarity index 100%
rename from extra/4DNav/multi solids.xml
rename to unmaintained/4DNav/multi solids.xml
diff --git a/extra/4DNav/prismetriagone.xml b/unmaintained/4DNav/prismetriagone.xml
similarity index 100%
rename from extra/4DNav/prismetriagone.xml
rename to unmaintained/4DNav/prismetriagone.xml
diff --git a/extra/4DNav/space-file-decoder/authors.txt b/unmaintained/4DNav/space-file-decoder/authors.txt
similarity index 100%
rename from extra/4DNav/space-file-decoder/authors.txt
rename to unmaintained/4DNav/space-file-decoder/authors.txt
diff --git a/extra/4DNav/space-file-decoder/space-file-decoder-docs.factor b/unmaintained/4DNav/space-file-decoder/space-file-decoder-docs.factor
similarity index 100%
rename from extra/4DNav/space-file-decoder/space-file-decoder-docs.factor
rename to unmaintained/4DNav/space-file-decoder/space-file-decoder-docs.factor
diff --git a/extra/4DNav/space-file-decoder/space-file-decoder.factor b/unmaintained/4DNav/space-file-decoder/space-file-decoder.factor
similarity index 100%
rename from extra/4DNav/space-file-decoder/space-file-decoder.factor
rename to unmaintained/4DNav/space-file-decoder/space-file-decoder.factor
diff --git a/extra/4DNav/summary.txt b/unmaintained/4DNav/summary.txt
similarity index 100%
rename from extra/4DNav/summary.txt
rename to unmaintained/4DNav/summary.txt
diff --git a/extra/4DNav/tags.txt b/unmaintained/4DNav/tags.txt
similarity index 100%
rename from extra/4DNav/tags.txt
rename to unmaintained/4DNav/tags.txt
diff --git a/extra/4DNav/triancube.xml b/unmaintained/4DNav/triancube.xml
similarity index 100%
rename from extra/4DNav/triancube.xml
rename to unmaintained/4DNav/triancube.xml
diff --git a/extra/4DNav/turtle/authors.txt b/unmaintained/4DNav/turtle/authors.txt
similarity index 100%
rename from extra/4DNav/turtle/authors.txt
rename to unmaintained/4DNav/turtle/authors.txt
diff --git a/extra/4DNav/turtle/turtle-docs.factor b/unmaintained/4DNav/turtle/turtle-docs.factor
similarity index 100%
rename from extra/4DNav/turtle/turtle-docs.factor
rename to unmaintained/4DNav/turtle/turtle-docs.factor
diff --git a/extra/4DNav/turtle/turtle.factor b/unmaintained/4DNav/turtle/turtle.factor
similarity index 100%
rename from extra/4DNav/turtle/turtle.factor
rename to unmaintained/4DNav/turtle/turtle.factor
diff --git a/extra/4DNav/window3D/authors.txt b/unmaintained/4DNav/window3D/authors.txt
similarity index 100%
rename from extra/4DNav/window3D/authors.txt
rename to unmaintained/4DNav/window3D/authors.txt
diff --git a/extra/4DNav/window3D/window3D-docs.factor b/unmaintained/4DNav/window3D/window3D-docs.factor
similarity index 100%
rename from extra/4DNav/window3D/window3D-docs.factor
rename to unmaintained/4DNav/window3D/window3D-docs.factor
diff --git a/extra/4DNav/window3D/window3D.factor b/unmaintained/4DNav/window3D/window3D.factor
similarity index 100%
rename from extra/4DNav/window3D/window3D.factor
rename to unmaintained/4DNav/window3D/window3D.factor