It is clipboard master.Only this software has autocopy feature by which text selected will be automatically copied and
one can paste it by clicking middle button of mouse.A feature missing in many other clipboard software's

It has a multi-clipboard that you can also use to access previous copies. Clipboard Master stores up to 10,000 entries.
Text, images, files and folders that you copy in Windows or a Windows program are automatically added to the Clipboard
Master multi-clipboard. The new entry is always added to the top of the list.


After you install this, go to settings and click extended view,then select autocopy and enable -- activate autocopy
and then configure it and see for Program related settings.
Now in the left side,select global in mouse and enable middle click there.

Other similar apps i tested are -- copyQ,clip angel,clip watch,winclipper,arsclip,,remembr,101 clips,tenclips