The Encyclopedia of Geometric Constructions. Is a shareware product.  It contains 50 files (minimum) of geometric constructions e.g. ellipse1.euk  using the file format of the Euklides dynamic geometry program www.euklides.hu also available as shareware from  www.shareit.com   The geometric constructions  include many complex constructions such as geometric harmonics on triangles and ellipse and the centers of similitude of circles of different radii to name a few.  These can now be easily used as base constructions for new constructions using Euklides.