Google Tasks alternative?

I am looking for alternative Task management systems other than Google where the tasks can be synced with EM Client 5 (and ideally also with Android phones).

Any suggestions appreciated, thank you!

Here we go:
https://play.google.com/store/apps/de…
Sync to your owncloud, Davical, etc.

Works as good as CalDAV-Sync
https://play.google.com/store/apps/de…

and CardDAV-Sync
https://play.google.com/store/apps/de…

Hello,

from eM Client account creation - yahoo, fruux, anything on caldav and maybe iCal if you have android client that supports it.

regards
Jan