PDFSAM is a professional software to merge and split PDF documents.
Here is a theme and icon pack which would make your Ubuntu installation look great.
Vivaldi – a modern web browser which gives you freedom to customize everything in a browser.
A complete guide to install Java/JRE/JDK on Ubuntu including Ubuntu 16.04 LTS Xenial Xerus.
Play Cloud Music Directly from Unity, GNOME Desktop.
Feature Tour of the Latest Xubuntu 16.04 LTS Release.
If you are bored with the default look of the Unity theme, here is a cool and modern theme and icon pack which you can install to give your desktop a makeover.