Adding not so much. The biggest difference is that it in the first place works on your local machine, so being offline isn't a problem, sensitive data aren't a problem.
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Sometimes simplicity is the best feature. Neat it works offline!
Personally I use Mailjet using SMTP. For most services, plain simple SMTP works best.
As I didn't found a setup that worked for me I created Millikanban as a free tool. Just a little kanban board, nothing else.
Oh cool! What did you add to Millikanban different from other kanban apps?
It dropped native IRC support so I switched to a external tool to provide this.
It integrates quite well with other tools, even just plain old email.