ABN Search is a deliberately simple tool for finding registered Australian businesses, available on both Windows and Windows Phone (8.1 or later for both) platforms. It supports both name and ABN searches.
It's designed primarily with convenience in mind much in the same way as classic Calculator where it's used side-by-side with financial applications (i.e. requisition officers and the like) and left permanently open. Focus is on easing the copy-and-paste process which along with its small screen footprint makes it a little more usable than a full screen or otherwise large browser.
The search width is deliberately narrowed to ensure small, fast searches are performed. Results can be narrowed further to exact matches if required.
Oh, and there's no ads!