Indicator Synapse is a Spotlight Alternative, developed by Tom Beckmann.
How to Install Indicator Synapse (Spotlight Alternative) on Ubuntu 14.04 LTS or Linux Mint 17 run this commands in terminal:
$ [sudo] add-apt-repository ppa:noobslab/apps
$ [sudo] apt-get update
$ [sudo] apt-get install indicator-synapse
After installation once you log out and log in then you can see indicator tool.
This also having a shortcut to use
Alt+Super+Space
it is not working with this shortcut you can go withAlt+F10
.
Shortcut can be solved with xdotool http://askubuntu.com/questions/386966/indicator-synapse-keyboard-shortcut.