diff --git a/src/AboutDialog.html b/src/AboutDialog.html
index 22ca9272..b2c2cc44 100644
--- a/src/AboutDialog.html
+++ b/src/AboutDialog.html
@@ -47,12 +47,18 @@ Please visit this link for a copy of the license: <a href="http://www.gnu.org/li
 <li><a href="http://gmplib.org/">GNU GMP</a>
 <li><a href="http://www.mpfr.org/">GNU MPFR</a>
 <li><a href="http://www.cgal.org">CGAL</a>
+<li><a href="http://www.angusj.com/delphi/clipper.php">Clipper</a>
 <li><a href="http://eigen.tuxfamily.org">Eigen</a>
 <li><a href="http://www.opencsg.org">OpenCSG</a>
 <li><a href="http://www.opengl.org/">OpenGL</a>
 <li><a href="http://glew.sourceforge.net">GLEW</a>
-<li><a href="http://qt.nokia.com">Qt Toolkit</a>
+<li><a href="http://qt-project.org">Qt Toolkit</a>
+<li><a href="http://www.riverbankcomputing.co.uk/software/qscintilla">QScintilla</a>
 <li><a href="http://www.boost.org">Boost</a>
+<li><a href="https://developer.gnome.org/glib">GLib</a>
+<li><a href="http://fontconfig.org">Fontconfig</a>
+<li><a href="http://freetype.org">Freetype</a>
+<li><a href="http://harfbuzz.org">Harfbuzz</a>
 <li><a href="http://www.gnu.org/software/bison/">Bison</a>
 <li><a href="http://flex.sourceforge.net/">Flex</a>
 <li><a href="http://www.cmake.org">CMake</a>