--- a/dup.rst	Wed Dec 14 18:46:20 2011 +0200
+++ b/dup.rst	Wed Dec 14 23:10:08 2011 +0200
@@ -13,6 +13,19 @@
   http://students.cis.uab.edu/tairasr/clones/literature/
                 Code Clones Literature
 
+Open source or free licence:
+
+ * http://duplo.sourceforge.net/
+ * http://clonedigger.sourceforge.net/
+ * http://www.ccfinder.net/ccfinderxos.html
+
+Proprietary or restricted licence:
+
+ * http://www.txl.ca/nicaddownload.html
+ * http://www.harukizaemon.com/simian/index.html
+ * http://getatomiq.com/
+ * http://www.harukizaemon.com/simian/index.html
+
 Search for duplicate files.
 ===========================