[TeMPOraL]

I use org-mode + orgzly on Android, synced via Dropbox.

Obviously, orgzly gives you only a small fraction of org-mode features, but you're still able to edit org files, view & search through tasks, display somewhat customized agendas and get reminders on tasks with scheduled dates and deadlines. That's enough to get me through the times when I don't have access to a computer with Emacs (or terminal & SSH, which I can use to connect to Emacs instance running on my home desktop).