`Albert` is a relatively new quick launcher for Linux, which might remind you of Alfred (Mac) or Synapse (Linux). Using it, you can quickly launch applications, open files or perform web searches.

For those not familiar with PhotoQt, this is a fast, Lightbox-style Qt5 image viewer which uses GraphicsMagick under the hood (so it supports over 80 file types).

Besides its image viewing capabilities, PhotoQt can be used for some basic image manipulation (flip, rotate, zoom) and file management (rename, delete, move, copy).

With the 2.7.x release, Caffeine stopped using an Ubuntu AppIndicator, a feature that many considered essential, resulting in various forks being developed. 

Well, there's no need for that any more because the latest Caffeine 2.8, released today, brings back the Ubuntu AppIndicator, which allows to inhibit the desktop idleness manually. You can continue to use Caffeine without an indicator: simply launch "Caffeine" from the menu / Dash. If you want to use the indicator, launch "Caffeine Indicator" instead:

As you probably know, in the current stable Ubuntu releases (12.04, 14.04 and 14.10), the Unity (global) menus are displayed on mouse over for both the default menu that's displayed on the top Unity panel and LIM (locally integrated menu), which is displayed in the application titlebar.

With Ubuntu 15.04, there's a new option (not enabled by default) which allows setting the Unity menus to always be visible:

DNSCrypt is a protocol for securing communications between a client and a DNS resolver, preventing spying, spoofing or man-in-the-middle attacks. To use it, you'll need a tool called dnscrypt-proxy, which "can be used directly as your local resolver or as a DNS forwarder, authenticating requests using the DNSCrypt protocol and passing them to an upstream server".

As you probably know, the latest Adobe Flash Player is available on Linux only via Google Chrome (it's bundled with it) while other browsers such as Firefox are stuck with an old 11.2 version.

The Adobe Flash Player plugin that's bundled with Google Chrome is in the form of a PPAPI (or Pepper Plugin API) plugin and Mozilla isn't interested in adding support for it. Because of this, Rinat Ibragimov has developed Fresh Player Plugin, a wrapper that allows Linux users to use Pepper Flash from Google Chrome in Firefox and other NPAPI-compatible browsers.