Gtumbler – Graphical PDF manager for Ubuntu

Graphical PDF manager for Ubuntu

With gtumbler you can
* convert many PostScript documents to PDF at once;
* concatenate many PostScript/PDF documents;
* crop margins (MediaBox, CropBox, BleedBox, TrimBox and ArtBox);
* invoke a PDF editor/annotator such as Xournal, PDFedit, or your custom application
* much more...

It's probably hard to tell, but the icon is indeed an upside-down T-shaped tumbler.

Install gtumbler in ubuntu 12.04

Open the terminal and run the following commands

sudo add-apt-repository ppa:phoenix1987/ppa
sudo apt-get update
sudo apt-get install gtumbler.

Source : http://www.ubuntugeek.com/gtumbler-graphical-pdf-manager-for-ubuntu.html