I assume you mean 'import' and furthermore that you in fact mean exporting from maya, not importing to maya. And that by wireframe editor you mean a 3D mesh modelling program.
I would recommend Blender at
www.blender.org which is free and very powerful, but will take you a little while to learn from maya depending upon your level of experience. You can get a .ase exporter plugin for Blender at
www.katsbits.com which is the default import format for UE3.
But you may find you need some help using it - I made a sticky on how to import from various programs to UE3 but it was lost in the great BU crash, and I can't be bothered to redo it frankly. Basically, install the plugin (look up tutorials on blender), export to .ase and import in the generic browser in UT3ed.