NeO NeO is a powerful outliner built for MacOS X 10.6.6 or greater. NeO is the refined and rebuilt version of TAO and is redesigned in order to support Mac OS X 10.6 or greater. Using NeO, you can efficiently manage and organize pieces of information. NeO supports basic outliner facilities, such as creating, moving, sorting, grouping, combining and gathering items. And the following useful facilit