Gmsh

Gmsh contains the ONELAB server, but is also a native ONELAB client for geometry, meshing and post-processing.

Any input file (.geo, .pos, scripts) read by Gmsh can be instrumented to interact with the ONELAB server. The syntax is the same as the one used by GetDP. This allows to write common parameter files for both Gmsh and GetDP.

See for example Electric Machines to see how both codes can be seamlessly controlled without data duplication.