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Persepolis
Persepolis is a download manager & a GUI for Aria2.
Gwenview
Gwenview is a fast and easy to use image viewer by KDE, ideal for browsing and displaying a collection of images.
GTK-gnutella
gtk-gnutella is a server/client for the Gnutella peer-to-peer network.
Shredder
finds space waste and other broken things on your filesystem and offers to remove it.
Cloaker
Very simple cross-platform file encryption
Eye of Gnome
Eye of GNOME is the GNOME image viewer.
Tixati
Tixati is a New and Powerful P2P System
RawTherapee
RawTherapee is a free, cross-platform raw image processing program
qBittorrent
The qBittorrent project aims to provide an open-source software alternative to µTorrent.