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.

• Euklides Dynamic Geometry - single user license 2.
  Euklides is a vectorgraphical geometric construction and designer program. A construction is not a static formation on a drawback, but - because of the mobility of base...

• EUKLID DynaGeo 2.
  With EUKLID you can make geometric constructions just like you do with ruler and compasses

• Euklides Dynamic Geometry - 20 user edu. license 2.
  Euklides is a dynamic geometric software. Main features: animation, macros, conics, point tracking, dynamic labels, layers, ...

• Euklides - additional 10 user edu. license 2.
  Euklides is a dynamic geometric software

• GEUP 2.
  GEUP is an interactive, powerful and easy to use software for learning and doing Geometry on the computer. It allows to verify geometric properties ina precise way and to discover new properties through the exploration. With GEUP we can explore mathematics visually and interactively, build mathematicals models of real world or...