MATE HUD, a Unity HUD-like tool that allows searching through an application's menu, was recently uploaded to the official Yakkety Yak repositories, and is available (but not enabled) by default in Ubuntu MATE 16.10.
EncryptPad is a free and open source text editor for sensitive information, which protects files with passwords, key files, or both, available for Linux, Windows and Mac. The app can also be used to encrypt binary files, such as images, videos, and so on.
According to its description, the main reason behind creating this application is to allow using your favorite video player, like VLC, Totem, mpv, and others to watch Twitch.tv streams (the app even allows watching multiple streams at once) instead of Flash.
Wmail is a free, open source desktop client for Gmail and Google Inbox, available for Linux, Windows and Mac.
The application is built using Electron and is basically just a wrapper for the original Gmail / Google Inbox interface, on top of which it adds features like native desktop notifications, an unread email list in the tray / appindicator, support for multiple accounts and more.
Almost two months after its first stable version, Terminix 1.1.0 beta was released today, bringing UI changes, support for background images and more.
In case you're not familiar with Terminix, this is a GTK3 tiling terminal emulator. The application allows splitting terminals, both horizontally and vertically (which can be re-arranged using drag'n'drop), and it features options to save and restore the layouts.