A huge collection of various general usage tools significantly extending standard ArcGIS for Desktop functionality. There are pretty simple yet
extremely useful and handy features like Start Editing Selected Layer, Open Attribute Table or Auto Save MXD, as well as powerful tools like
Metadata Editor including batch metadata editing capabilities. There are more advanced analogs of the standard ArcGIS features like Smart Add
Data dialog and there are tools allowing to do things you simply cannot do in ArcGIS without XTools Pro, e.g. Multiple Layouts, Copy/Paste Layer
Properties or Map Theme Manager, and many, many more.