You can use the ROP Output Driver in SOPs or the Geometry node in ROPs to export files. Under File > Export there are a few options as well. read more
Type in the name you like. Add a file suffix. Houdini will automatically export to the given format depending on that suffix. For alembic use .abc, for an OBJ use .obj. Click on “Accept” to export your geo. You can now import that file into any other software you like. read more