Here is the Top 9 Indicator Applets For Ubuntu and Linux Mint. Install it and enjoy..!!
1. Indicator for DesktopNova
DesktopNova is application for change your desktop wallpaper automatically. You can set the time for change the wallpaper automatically. And you can choose the image from a single files or folder.
Install desktopnova on ubuntu and Mint
sudo apt-get install desktopnova desktopnova-module-gnome
Install DesktopNova Indicator
sudo add-apt-repository ppa:michael-astrapi/ppa
sudo apt-get update
sudo apt-get install indicator-desktopnova
2. Indicator for VirtualBox
Install the VirtualBox Indicator
sudo add-apt-repository ppa:michael-astrapi/ppa
sudo apt-get update
sudo apt-get install indicator-virtualbox
3. Indicator for DropBox
Dropbox is a desktop application, you can run this application on Linux, Windows, Mac operating system. And it is also a collection box of your favourits memories like photos, documents, videos and files.
Install DropBox Indicator
sudo apt-key adv --keyserver pgp.mit.edu --recv-keys 5044912E
sudo add-apt-repository "deb http://linux.dropbox.com/ubuntu $(lsb_release -sc) main"
sudo apt-get update && sudo apt-get install nautilus-dropbox
4. Indicator for CPU Frequency
CPU frequency scalling enables the operating system to scaale the CPU frequency up or down in order to save power. CPU frequencies can be scaled automatically depending on the system load, in response to ACPI events, or manually by userspace programs. CPU frequency scaling is implemented in Linux kernel, the infrastructure is called cpufreq.
Install CPU frequency
sudo add-apt-repository ppa:artfwo/ppa
sudo apt-get update
sudo apt-get install indicator-cpufreq
5. Indicator for Workspace
sudo add-apt-repository ppa:geod/ppa-geod
sudo apt-get update
sudo apt-get install indicator-workspaces
6. Indicator for Keylock
Keylock is collection of all lock button in the keyboard like NUM lock, CAPS lock, Screen lock. The most keyboards found in laptop and notbook do not come with dedicated num and screen lock buttons. If you use the application indicator you can turn on the required keylock without the help of keyboard.
sudo add-apt-repository ppa:tsbarnes/indicator-keylock
sudo apt-get update
sudo apt-get install indicator-keylock
7. Indicator for Ubuntu one
Ubuntu one is a online services, this services enables users to store and synchronized files. It using synchronization method for share the files and folders.
sudo add-apt-repository ppa:rye/ubuntuone-extras
sudo apt-get update
sudo apt-get install ubuntuone-indicator
8. Indicator for Lookit
Lookit is a screen tool for capture the entire screen or an area, after that it can save on the desktop or upload to a FTP, SSH server.
sudo add-apt-repository ppa:lookit/ppa
sudo apt-get update
sudo apt-get install lookit
After installation process, press "Alt + F2" and type lookit to activate the appindicator.
9. Indicator for Touchpad
Touchpad indicator allows you to enable or disable the touchpad movements on your system. This application includes tray indicator to easily change settings, it offers easy access to enable and disable touch-pad from tray, auto-start at login, icon/notification indicate current status of touch-pad.
sudo add-apt-repository ppa:atareao/atareao
sudo apt-get update
sudo apt-get install touchpad-indicator