Thanks for the suggestion HeadClot, but we use Server behind our dedicated servers firewall & while Trello is good it does not suit our needs due to its lack of complexity.
With that being said,
Trello is very handy when tracking small projects or personal tasks & I sometimes use it for just that 
P.S. before you ask we use Stash for our source control & HipChat Server for our communications, however Perforce Helix seems appealing & if it weren’t for Slack being Cloud-only we would’ve gone with it over HipChat Server.
[HR][/HR]
Best we keep on the topic of this thread moving forward though
But perhaps in future I might consider writing a wiki post on the subject of the ideal overall production tools for international teams 