Evolution is a personal information management application that provides integrated mail, calendaring and address book functionality.
Drawpile
Drawpile is a Free software collaborative drawing program that allows multiple users to sketch on the same canvas simultaneously.
Desen
This application is a basic image editor, similar to Microsoft Paint, but aiming at the GNOME desktop.
DigiKam
Professional Photo Management with the Power of Open Source
Biglybt
BiglyBT is a feature filled, open source, ad-free, bittorrent client.
VeraCrypt
VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
DeaDBeeF
DeaDBeeF lets you play variety of audio formats, convert between them, customize the UI almost any way you want, and use many additional plugins which can extend it even more.
VirtualBox
VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product for enterprise as well as home use. Not only is VirtualBox an extremely feature rich, high performance product for enterprise customers, it is also the only professional solution that is freely available as Open Source Software under the terms of the GNU General Public License (GPL) version 2.
Blender
Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline—modeling, rigging, animation, simulation, rendering, compositing and motion tracking, video editing and 2D animation pipeline.
TiddlyWiki
TiddlyWiki is a personal wiki and a non-linear notebook for organising and sharing complex information. It is an open-source single page application wiki in the form of a single HTML file that includes CSS, JavaScript, and the content. It is designed to be easy to customize and re-shape depending on application. It facilitates re-use of content by dividing it into small pieces called Tiddlers.