Things to do after installing fresh Elemtary OS Freya

# 01 - Update your system
sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist upgrade

# 02 - Install additional drivers
Software & Updates - Additional Drivers

# 03 - Install Multimedia Codecs and Enable DVD Playback
sudo apt-add-repository ppa:mc3man/trusty-media
sudo apt-get update
sudo apt-get install ubuntu-restricted-extras ffmpeg gstreamer0.10-plugins-ugly libavcodec-extra-54 libvdpau-va-gl1 libmad0 mpg321 gstreamer1.0-libav
#Enable DVD Playback
sudo /usr/share/doc/libdvdread4/install-css.sh

# 04 - Install VLC Media Player
sudo apt-get install vlc

# 05 - Install Plugin Flash Player and Pepper Flash
sudo apt-get install flashplugin-installer pepperflashplugin-nonfree

# 06 - Install JAVA
sudo add-apt-repository -y ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java9-installer

# 07 - Install Support for Archive Formats and Restricted Extras
sudo apt-get install unace rar unrar p7zip-rar p7zip sharutils uudeview mpack arj cabextract lzip lunzip

# 08 - Install LibreOffice Suites
sudo apt-get install libreoffice libreoffice-gtk libreoffice-style-sifr

# 09 - Install Additional Web Browser
sudo apt-get install chromium-browser firefox

# 10 - Install Torrent Client
sudo apt-get install transmission

# 11 - Install Download Manager
wget http://xdman.sourceforge.net/xdman_mi...
sudo dpkg -i xdman_mint_ubuntu.deb

# 12 - Install Graphic Editor
sudo apt-get install gimp inkscape

# 13 - Install Indicator Synapse
sudo apt-get install indicator-synapse

# 14 - Install Elementary Tweak
sudo apt-add-repository ppa:mpstark/elementary-tweaks-daily
sudo apt-get install elementary-tweaks

# 15 - Insall Birdie Twitter Client
sudo add-apt-repository ppa:birdie-team/stable
sudo apt-get update
sudo apt-get install birdie

# 16 - Install Pidgin and Skype
sudo apt-get install skype pidgin

# 17 - Install Steam Gaming Client
sudo apt-get install steam

# 18 - Install Bleachbit System Cleaner
sudo apt-get install bleachbit

# 19 - Install Cloud Storage
Download DropBox Install Google Drive :
sudo add-apt-repository ppa:alessandro-strada/ppa
sudo apt-get update
sudo apt-get install google-drive-ocamlfuse

# 20 - For Laptop : Install TLP for Improve Battery Life and Reduce Overheating
sudo add-apt-repository ppa:linrunner/tlp
sudo apt-get update
sudo apt-get install tlp tlp-rdw
sudo tlp start

# 21 - Change terminal (Pantheon) color sheme:
URL: Mayccoll
wget -O xt http://git.io/v3Dlm && chmod +x xt && ./xt && rm xt
wget -O xt http://git.io/v3D44 && chmod +x xt && ./xt && rm xt
wget -O xt http://git.io/v3D8R && chmod +x xt && ./xt && rm xt
wget -O xt http://git.io/v3D44 && chmod +x xt && ./xt && rm xt
Also apt-get install dconf-editor, go to org->pantheon->terminl->settings

#22 - Install devbox tools
Install ruby on rails
Install Node.js 4.x