Century Research Center is to become the distributor for four plant design software packages from the US and Canada: three are MS-DOS and OS/2 packages from Californian Engineering Design Automation Inc – AutoPipe, for pipe stress analysis, from $9,600; Auto-stress, a three-dimensional bridge structure analysis pack age, $4,800; and AutoNozzle, $1,600; and the fourth, from Endeko Systems of Alberta, Canada, is a design system called Cad Pipe, costing from $6,400 to run on ATs; the last has been a hit product in North America with over 300 copies sold last year.