Updated README.md to include a list of alternatives

README.md

@@ -1,4 +1,25 @@
 phpspecgen
 ==========
 
-phpspecgen is a library for generating HTML documentation for Semantic Web based on ontology definitions in RDFS and OWL.
+phpspecgen is a library for generating HTML documentation for Semantic Web based on ontology definitions in [RDFS] and [OWL].
+
+It is written in PHP and uses the [EasyRdf] library.
+
+
+Alternatives
+------------
+
+Some alternative RDF specification generators include:
+
+- http://github.com/specgen/specgen/
+- http://vocab.org/2004/03/toolchain
+- http://moustaki.org/ontospec/
+- http://github.com/ldodds/dowl
+- http://kantenwerk.org/vocdoc/
+- http://neologism.deri.ie/
+
+
+[RDFS]:    http://www.w3.org/TR/rdf-schema/
+[OWL]:     http://www.w3.org/TR/owl-ref/
+[EasyRdf]: http://github.com/njh/easyrdf
+