Linux

sudo apt-get install xosd-bin

--The vertical position of the text. POS can be top, middle, or bottom. The default is top.
local osd_pos="top"
--The number of pixels the text is offset from the top or bottom of the display. The default is 0.
local osd_offset=44
--The horizontal alignment of the text. ALIGN can be left, centre or right. The default is centre.
local osd_align="right"
--The number of pixels the text is indented from the left or right of the display. The default is 0.
local osd_indent=0
--The font used to display the text. The default is fixed, which may be too small to see clearly.
local osd_font="-adobe-helvetica-bold-*-*-*-14-*-*-*-*-*-*-*"
--The text colour. The default is red.
local osd_colour="red"
--The number of seconds the text is displayed before being removed from the display. The default is 5.
local osd_delay=100
--The maximum number of lines that can be displayed. The default is 5.
local osd_lines=5
--The number of pixels the shadow is offset behind the text. The default is 0, so no shadow is displayed.
local osd_shadow=1
--The colour of the shadow. The default is black.
local osd_shadowcolour="black"
--The width of the outline, in pixels. The default is 0, so no outline is displayed.
local osd_outline=1
--The colour of the outline. The default is black.
local osd_outlinecolour="black"
--This option affects screen redrawing. If SCROLL_AGE seconds pass before a new line is ready (for example, you're reading from a pipe), the display is cleared instead of being scrolled. The default is 0, which means all lines are added to the scroll.
osd_age=100

local clients = {}

local oldOnTalkStatusChangeEvent = onTalkStatusChangeEvent;

function onTalkStatusChangeEvent(serverConnectionHandlerID, status, isReceivedWhisper, clientID)
oldOnTalkStatusChangeEvent(serverConnectionHandlerID, status, isReceivedWhisper, clientID)
local msg="";
clients[clientID]=status;
for k,v in pairs(clients) do
if (v==1) then
local clientName, error = ts3.getClientVariableAsString(serverConnectionHandlerID, k, ts3defs.ClientProperties.CLIENT_NICKNAME);
msg = msg .. "\n" .. clientName;
end
end
if (msg=="") then
os.execute("killall osd_cat")
return
end
os.execute("killall osd_cat")
os.execute("echo \"" .. msg .. "\" | osd_cat --pos=" .. osd_pos .. " --offset=" .. osd_offset .. " --align=" .. osd_align .. " --indent=" .. osd_indent .. " --font=" .. osd_font .. " --colour=" .. osd_colour .. " --delay=" .. osd_delay .. " --lines=" .. osd_lines .. " --shadow=" .. osd_shadow .. " --shadowcolour=" .. osd_shadowcolour .. " --outline=" .. osd_outline .. " --outlinecolour=" .. osd_outlinecolour .. " --age=" .. osd_age .. " &")
end

require("osd")