Postprocessing ToughReact (or Tough2)

Hi. Any preferred tool for post processing, including visualization and analysis ability for ToughReact? Seems that Tecplot is used by some people. But the vendor states that the output files (or Mesh) should be converted by a converter before you can establish it in Tecplot and he referred to Ext.exe free software provided (or linked) by LBNL. Have you any knowledge or recommendation about this?  Appreciate your comments.