• ppa:xubuntu-dev/extras
• Looks like xfdashboard and xfce4-soundmenu-plugin are two good candidates.

If we go with xfdashboard, use only the stable branch or stick with the latest development release?

• Basic stats, could be a little off but gives the general idea.

extras-stats.txt

usage stats for PPA with owner "xubuntu-dev" named "extras"
 
 == vivid/i386 ==
Name                      Version                  Count
skippy-xd                 0.5.1~git20141025~ubuntu15.04.1    1
xfce4-soundmenu-plugin    0.7.0-0ubuntu1~15.04         1
xfdashboard               0.3.4-0ubuntu1~15.04         1
 
 == utopic/i386 ==
Name                      Version                  Count
libmpris2client-bin       0.1.0-0ubuntu1~14.10         1
libmpris2client0          0.1.0-0ubuntu1~14.10         5
skippy-xd                 0.5.1~git20141020~ubuntu14.10.1    2
thunar-dropbox-plugin     0.2.0+dfsg1-2fakesync1~14.10    8
xfce4-soundmenu-plugin    0.7.0-0ubuntu1~14.10         5
xfdashboard               0.3.4-0ubuntu1~14.10         5
 
 == trusty/i386 ==
Name                      Version                  Count
hexchat-indicator         0.4.0~bzr3-0ubuntu1~14.04    2
libmpris2client-bin       0.1.0-0ubuntu1~14.04         2
libmpris2client-dev       0.1.0-0ubuntu1~14.04         1
libmpris2client0          0.1.0-0ubuntu1~14.04        18
skippy-xd                 0.5.1~git20141020~ubuntu14.04.1   17
thunar-dropbox-plugin     0.2.0+dfsg1-2fakesync1~14.04  117
xfce4-hamster-plugin      1.6-0ubuntu1~14.04           4
xfce4-soundmenu-plugin    0.7.0-0ubuntu1~14.04        20
xfdashboard               0.3.4-0ubuntu1~14.04        48
 
 == vivid/amd64 ==
Name                      Version                  Count
xfce4-soundmenu-plugin    0.7.0-0ubuntu1~15.04         1
 
 == utopic/amd64 ==
Name                      Version                  Count
libmpris2client-dev       0.1.0-0ubuntu1~14.10         1
libmpris2client0          0.1.0-0ubuntu1~14.10        21
skippy-xd                 0.5.1~git20141020~ubuntu14.10.1   10
thunar-dropbox-plugin     0.2.0+dfsg1-2fakesync1~14.10   47
xfce4-hamster-plugin      1.6-0ubuntu1~14.10           4
xfce4-soundmenu-plugin    0.7.0-0ubuntu1~14.10        19
xfdashboard               0.3.4-0ubuntu1~14.10        25
 
 == trusty/amd64 ==
Name                      Version                  Count
hexchat-indicator         0.4.0~bzr3-0ubuntu1~14.04    4
libmpris2client-bin       0.1.0-0ubuntu1~14.04         7
libmpris2client-dev       0.1.0-0ubuntu1~14.04         5
libmpris2client0          0.1.0-0ubuntu1~14.04        51
skippy-xd                 0.5.1~git20141020~ubuntu14.04.1   38
thunar-dropbox-plugin     0.2.0+dfsg1-2fakesync1~14.04  298
xfce4-hamster-plugin      1.6-0ubuntu1~14.04           5
xfce4-soundmenu-plugin    0.7.0-0ubuntu1~14.04        51
xfdashboard               0.3.4-0ubuntu1~14.04       117