iw3d: a GNU licensed (GPL) java programm for quality weighted gridding of 3-dimensional scattered data with the inverse-distances method. iw3d has a graphical user interface. download iw3d  

jk3d: a GNU licensed (LGPL) java programm for quality weighted ordinary kriging of 3-dimensional scattered data. jk3d is a command line program, similar to the GSLIB programs. download jk3d