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Aura handles the rendering, compositing and so on, using the GPU when possible. For technical details, see THIS page.

Update: February 6, 2014: these features were removed once again from Google Chrome Unstable for Linux (version: 34.0.1825.4-1). Hopefully they will return soon.

Update February 27, 2014: the Aura UI along with the Notification Center, App Launcher, etc. are one again available in the latest Google Chrome Dev Channel Linux builds (Version 35.0.1862.2 dev aura):

Chrome Notification Center

Chrome Notification Center with Google Now cards on Ubuntu

Chrome App Launcher

Download Google Chrome unstable (dev channel)

sudo apt-get update
sudo apt-get install google-chrome-unstable

My Weather Indicator, an Ubuntu AppIndicator for displaying the current weather on the panel, was updated to version 0.6.8 today, receiving numerous bug fixes as well as a few other changes.

My Weather Indicator and one of its optional desktop widgets

• displays current temperature, humidity, wind, sunrise, sunset, etc. in the indicator menu;
• supports the following weather services APIs: Open Weather Map, Yahoo!, Wunderground and World Weather Online (the last two require an API which you can obtain by registering on the corresponding website);
• weather forecast;
• multiple locations support;
• optional notifications support;
• supports imperial and metric units;
• if you need more than just an AppIndicator, My Weather Indicator can also display (optional) various weather widgets on your desktop (the current version comes with 8 different widgets).

• weather applet crashes frequently in 14.04;
• crash w/ coredump on first run in some cases;
• my-weather-indicator blocks suspend / standby on Ubuntu 14.04 in some cases;
• crash with OpenWeatherMap;
• Forecast not fitting on 1024X600 screen;
• characters outside of the widget;
• weather applet crashed on login if there is no connection;
• get_dew_point raises unhandled ValueError with negative humidity;
• widgets close when reducing all windows;
• font characters in widget showing as squares in some cases;
• added support for Vietnamese font;
• local time incorrect when 24 hr format used as system time;
• Evolution crashes with yahoo service;
• Yahoo weather service always showing forecast conditions the same as current;
• Shows all day sunrise as all day sunset;
• wrong time in Dawn/Sunrise/Sunset/Dusk (i.e. "20:60");
• weather doesn't update in some cases;
• second weather location displays wrong time by -2Hrs;
• no forecast data for the next 4 days from Yahoo;
• current weather symbol for the secondary location is wrong;
• evolution only on Second Location and not working properly;
• occasional HTTP 503 errors causes applet to stop updating;
• time not synchronized from widget to PC;
• weather applet doesn't start in some cases;
• second location missing from panel after reboot;
• incorrect icons: daytime ones displayed at night;
• day/night time weather icon problem for the second location;
• auto location not working at all;
• My-weather-indicator crashes on Ubuntu 13.10 in some cases;
• crash on startup after changing weather source;
• wrong Sunrise and Sunset time;
• more.

Install My Weather Indicator in Ubuntu

sudo add-apt-repository ppa:atareao/atareao
sudo apt-get update
sudo apt-get install my-weather-indicator python3-requests

• Universal copy & paste is now bidirectional (until now, this only worked one way: copying something on your Android device and pasting it on the Ubuntu desktop). For this feature to work, you need to enable Universal copy & paste in both Pushbullet Indicator and the Pushbullet app on your mobile device; 
• send SMS from the desktop. Important: using this feature, the SMS is sent via your mobile phone so it doesn't mean that the SMS is free! Unfortunately, to use this feature, you must know the phone number because Pushbullet Indicator doesn't retrieve your contacts list;
• reply to Whatsapp, Telegram and SMS from the desktop (you must enable this from the Pushbullet Indicator settings);
• you can now select the device to send text/links/files/etc. from the PushBullet send dialog.

Install Pushbullet Indicator in Ubuntu 15.04, 14.10 or 14.04 / Linux Mint 17.1 or 17 Cinnamon

sudo add-apt-repository ppa:atareao/atareao
sudo apt-get update
sudo apt-get install pushbullet-indicator

sudo apt-get install nautilus-pushbullet
nautilus -q

sudo apt-get install nemo-pushbullet
nemo -q

Install Indicator Netspeed in Ubuntu

sudo add-apt-repository ppa:nilarimogard/failsdownloads
sudo apt-get update
sudo apt-get install indicator-netspeed

• supports multiple accounts;
• share files via file manager;
• Google Docs conversion;
• share files outside your Insync folder from the file manager (uses symbolic links, at least on Linux);
• supports external & network drives;
• recent changes feed;
• desktop notifications;
• selective sync;
• proxy support;
• more.

Download Insync

• four panel display modes: download, upload or total (either merged or separated) network speed;
• configurable bit rate prefix;
• shows total downloaded and uploaded data for the current session in the indicator menu ("All" item);
• enable/disable padding - when enabled, it preserves the indentation of indicator text (I recommend disabling this or else you'll end up with a gap between the icons and text);
• supports using custom icons (available via Dconf);
• added a settings menu which allows changing the upload/download prefix, change the theme to dark/light or current (system) theme and run nethogs for a more detailed analysis.

sudo apt-get install dconf-editor

Install Indicator Netspeed Unity in Ubuntu

sudo apt-add-repository ppa:fixnix/netspeed
sudo apt-get update
sudo apt-get install indicator-netspeed-unity

• easily connect to your SSH hosts and MySQL servers;
• run various commands / tasks (e.g. navigate to a folder, ping google.com and so on);
• GUI to add new SSH hosts or localhost tasks.

Install Guake Indicator in Ubuntu

sudo add-apt-repository ppa:gun101/ppa
sudo apt-get update
sudo apt-get install guake-indicator

• no configuration required: each device running NitroShare broadcasts its presence to other devices on the network;
• supports transferring files as well as directories;
• displays desktop notifications for completed transfers or when someone on the local network starts or quits NitroShare;
• simple, easy to use user interface.

NitroShare Settings and Transfers

Download NitroShare

sudo add-apt-repository ppa:george-edison55/nitroshare
sudo apt-get update
sudo apt-get install nitroshare

When this mode is used, the system tray icons aren't hidden (until you middle-click it again).

You can move the icons horizontally by scrolling on the Indicator Systemtray icon on the Unity panel. Moving the icons to the left of the indicators like in the screenshot above is a bit tricky because once the icons are on top of Indicator Systemtray, you won't be able to scroll on it any more, but you can change this via dconf-editor (see below).

Update: you can now change background for both indicator modes. However, to be able to access the background settings from the indicator menu, you need to set Indicator Systemtray Unity to the floating mode (mode 1 above):

sudo apt-get install dconf-editor

Install Indicator Systemtray Unity in Ubuntu

sudo apt-add-repository ppa:fixnix/indicator-systemtray-unity
sudo apt-get update
sudo apt-get install indicator-systemtray-unity

sudo apt-get purge indicator-systemtray-unity

"I've found this indicator [Messaging Menu] to be much less usable than the original Pidgin tray icon, so I decided to build this plugin to restore the icon's functionality in a maintainable way (in constrat to having to run a patched version of Unity)."

- app description @ GitHub

Install Pidgin Indicator plugin in Ubuntu

sudo add-apt-repository ppa:nilarimogard/failsdownloads
sudo apt-get update
sudo apt-get install pidgin-indicator

• display notifications from your Android device on your desktop (requires Android 4.3+);
• send files from your Android device to your desktop and the other way around "without wires";
• touchpad emulation: use your phone screen as your computer's touchpad (keyboard emulation is also available);
• shared clipboard between your phone and computer;
• display your phone's battery status on the desktop;
• multimedia remote control: use your Android device to control various Linux media players;
• RSA Encryption.

• displays the device name, status and battery level;
• menu item to request for pairing and unpairing;
• menu item to start sftp and open the file browser.

• you can only pair the device by sending the request from the desktop (I'll add instructions below) - that's because Unity (and some other DEs) don't support clicking on notifications to accept or reject the pairing request;
• KDE Connect Indicator depends on KDE Connect (obviously), which depends on quite a few KDE packages that will be installed even though you're not using KDE. Unfortunately there's no way around this.

Configuring KDE Connect Indicator

How to install KDE Connect Indicator and the latest KDE Connect in Ubuntu

sudo add-apt-repository ppa:vikoadi/ppa
sudo apt-get update
sudo apt-get install indicator-kdeconnect kdeconnect

• shows current score as indicator label;
• updated as soon as espncricinfo is updated;
• submenu shows the scorecard of corresponding match;
• categories for International and Domestic matches;
• option to set a particular match score as indicator label;
• adds new match as it is available and deletes the unavailable ones;
• Icon shows the runs scored on the last delivery of the corresponding match;
• Initially all submenus (scorecards) are hidden to reduce network usage.

Install Cricket Score Indicator in Ubuntu

sudo add-apt-repository ppa:rawcoder/cricket-score-indicator
sudo apt-get update
sudo apt-get install cricket-score-indicator

pip install -i https://pypi.python.org/pypi cricket_score_indicator

Install Caffeine Plus in Ubuntu 14.04 or 14.10

sudo add-apt-repository ppa:nilarimogard/failsdownloads
sudo apt-get update
sudo apt-get install caffeine-plus

• Supports the following weather services: Gismeteo.com and AccuWeather.com (weather.com was removed in the latest release);
• View weather for several days;
• Detailed weather forecast for today and tomorrow;
• Fast switching between cities;
• Select the background and theme weather icons;
• "Compass" with the wind direction, with adjustable angle of rotation
• High wind highlighting;
• Supports SVG and widget scale;
• Ubuntu AppIndicator and tray icon;
• 4 different widget presets;
• Configurable units for temperature, wind, pressure, etc.;
• Supports multiple instances.

Download Gis Weather

Install Twitch Indicator in Ubuntu

sudo add-apt-repository ppa:nilarimogard/failsdownloads
sudo apt-get update
sudo apt-get install twitch-indicator

However, you can get Xkbmod Indicator to work with any theme if you set it to use labels (text) instead of an image for the indicator. But in that case, only the active keyboard modifiers will be displayed, which will make the indicators shift each time you press a keyboard modifier so that might be annoying:

Install Xkbmod Indicator in Ubuntu

sudo add-apt-repository ppa:nilarimogard/failsdownloads
sudo apt-get update
sudo apt-get install indicator-xkbmod