I just installed Blender v2.8 but I can't seem to find any Transform tool. Has it been removed or do I have to show it?
Yes it has. As explained in April 15th's developer meeting notes:
Transform gizmos can now be enabled in the 3D viewport independent of active tools, from a popover menu in the header. The same popover also has controls for display of other gizmos. The Transform tool was removed as it is now redundant. (Campbell Barton)