Build in support for Ayatana notification using the libindicate or libappindicator plugin
Name Category Description
choqok net-im Free/Open Source micro-blogging client by KDE
clementine media-sound Modern music player and library organizer based on Amarok 1.4 and Qt
geary mail-client A lightweight, easy-to-use, feature-rich email client
greybird x11-themes Greybird Desktop Suite
guayadeque media-sound Music management program designed for all music enthusiasts
liferea net-news News Aggregator for RDF/RSS/CDF/Atom/Echo feeds
lightdm-gtk-greeter x11-misc LightDM GTK+ Greeter
nm-applet gnome-extra NetworkManager connection editor and applet
quassel net-irc Qt/KDE IRC client supporting a remote daemon for 24/7 connectivity
redshift x11-misc A screen color temperature adjusting software
remmina net-misc A GTK+ RDP, SPICE, VNC and SSH client
signal-desktop-bin net-im Allows you to send and receive messages of Signal Messenger on your computer
slack net-im Team collaboration tool
synapse gnome-extra A program launcher in the style of GNOME Do
transmission net-p2p A fast, easy, and free BitTorrent client
transmission-remote-gtk net-p2p GTK+ client for management of the Transmission BitTorrent client, over HTTP RPC
uget www-client Download manager using gtk+ and libcurl
xnoise media-sound A media player for Gtk+ with a slick GUI, great speed and lots of features

Thank you!