NoNotifications is an Ubuntu indicator for temporarily suppressing NotifyOSD (which is used by Unity) notifications. This can be useful for presentations, when working, and so on, to prevent unwanted notifications.
The indicator was completely rewritten recently, bringing some new features.
It looks like Livestreamer is no longer maintained, so a fork, called Streamlink, was created recently. There are no Ubuntu packages for the new fork, so I uploaded Streamlink to the main WebUpd8 PPA.
The PPA uses the Livestreamer Debian packaging, renamed for Streamlink, so the packaging credits go to Stefan Breunig, the Livestreamer Debian maintainer.
In case you're not familiar with Livestreamer, this is a command line utility (and API is also available) that pipes video streams from services such as Livestream, Twitch, UStream, Youtube Live and more, to video players like VLC, mpv, and so on.
SafeEyes is an application that tries to protect your eyes from eye strain (asthenopia) by reminding you to take breaks while you're working long hours at the computer. It was created as a free and open source Linux alternative for EyeLeo, a Windows-only app.
WMail is a free, open source desktop client for Gmail and Google Inbox, available for Linux, Windows, and Mac.
The application is a wrapper for Gmail / Google Inbox with unlimited account support, on top of which it adds features such as native desktop notifications (notification bubble and sound), unread email counter in the tray, and more.
Prime Indicator is an AppIndicator for laptops with Nvidia Optimus, allowing users to quickly switch between Intel and Nvidia graphics.
The original Prime Indicator hasn't been updated since February, 2015. André Brait forked the indicator (while also using code from the Linux Mint version), improving it with both new functionality and bug fixes, and the new app is called Prime Indicator Plus.
Canonical launched the Canonical Livepatch Service recently, an "authenticated, encrypted, signed stream of livepatch kernel modules for Ubuntu servers, virtual machines and desktops", applying critical security and vulnerability patches without requiring a reboot.
The new service is commercial (commercial support subscriptions start at $12 / month), but it's offered for free to the Ubuntu community, for up to 3 systems.