Feature, tweaks are tested by NoobsLab

Minimize on click had landed in Ubuntu 14.10 Utopic/14.04 Trusty and it is disabled by default, it is still unsupported in Ubuntu 15.04 but you can enable it from compiz manager.
To install CCSM enter following command in Terminal:
Terminal Command:
sudo apt-get install compizconfig-settings-manager
Go to Dash and Search "CCSM" > Then go to Unity plugin > Tick 'Minimize Single Window Applications' feature
Install Drivers via Additional Drivers:
If you want to get better experience from Ubuntu then always install recommended drivers. You can choose best drivers available for your hardware via "Additional Driver" and can be install/uninstall easily.

Open Dash and Search for "Software & Updates" or "Additional Drivers" open it and navigate to Additional Drivers "Tab".
Unity Tweak Tool is a configuration tool for the Unity Desktop, providing users access to features and configuration options, and brings them all together in a polished & easy-to-use interface.
Install Tweak Tools with following command:
Terminal Command:
sudo apt-get install unity-tweak-tool
Show username on panel:
By default current logged-in username doesn't show on panel, so you can enable it easily.
Enter following command in terminal:
Terminal Command:
gsettings set com.canonical.indicator.session show-real-name-on-panel true
Enable Locally Integrated Menus & Scale Title + Menus:
LIM (Locally Integrated Menus)
Local Integrated Menus display on the Title bar of any un-maximized Window. By default it is disabled, if you like it you can enable it easily. Go to System Settings > Appearance > Behavior > under 'Show the menus for a window' > select "In the window's title bar"
Scale Title bars & Menu
A new feature added to Unity, now you can increase/decrease size of Menus & Title bars easily. Go to System Settings > Displays > under 'Scale for menu and title bars' > adjust as per your Needs

Install Gimp Image Editor:
GIMP is the GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring.
gimp
Enter following command in terminal to install gimp:
Terminal Command:
sudo apt-get install gimp gimp-data gimp-plugin-registry gimp-data-extras
Firewall for Ubuntu:
Linux don't need Anti-virus but Firewall is important for any kind of Operating System. UFW is installed by default in Ubuntu but it is command line and disabled by default. You can install best firewall GUFW enable and manage it graphically.
Enter following command in terminal to install firewall:
Terminal Command:
sudo apt-get install gufw
After installation open Dash and Search "GUFW" to configure it.
Install Adobe Flash Plugin:
Flash player isn't available by default , So you can install flash player easily from Ubuntu repositories.

ubuntu flash
Open Terminal and enter following commands:
Terminal Command:
sudo apt-get install flashplugin-installer
Alternatively: install Adobe flash from canonical partner repository, open Software-Sources > Tab 'Other Software' and tick 'Canonical Partners'
Now enter these to commands to update and install adobe flash:
Terminal Command:
sudo apt-get update
sudo apt-get install adobe-flashplugin
Also install Silverlight alternative Pipelight for Web browsers.
Install Restricted Extras:
There are some Restricted extras available in Ubuntu repositories which can't be install while installation but you can install these Restricted extras by yourself. Restricted extras contains: mp3 playback and decoding, support for various formats, fonts, java, flash plugin, lame, dvd playback.
Terminal Command:
sudo apt-get install ubuntu-restricted-extras

14: Codecs and Enable DVD Playback:
If you are multimedia user and use Ubuntu for multimedia then these codecs are very useful for you. You can install them by single command.
Terminal Command:
sudo apt-get install ffmpeg gstreamer0.10-plugins-ugly gxine libdvdread4 icedax tagtool easytag id3tool lame libxine2-ffmpeg nautilus-script-audio-convert libmad0 mpg321 libavcodec-extra gstreamer1.0-libav
Compression/Decompression tools:
You can compress and decompress 7z, zip, gzip, rar, xz, tar, bz2, xar, tar.gz, tar.bz, and many others.
Enter following command in terminal to install:
Terminal Command:
sudo apt-get install p7zip-rar p7zip-full unace unrar zip unzip sharutils rar uudeview mpack arj cabextract file-roller