Paul BuetowAnyone knows a todo/reminder tool which I can use from the command line and can send out E-Mails?
I am looking tools similar to `cal`, the calendar tool inlcuded in the #OpenBSD base system, which is E-Mailing me when an event takes place.
I have also found #TaskChampion! https://taskchampion.github.io/taskchampion/ But for now, I am settled with #TaskWarrior. I have also scripted a small Bash-integration, so that my Ad-hoc NextCloud Notes taken on my Android Phone (starting with Task or Log) are automatically added to my TaskWarrior DB whenever I use my Laptop! Auto backup of my DB is done via NextCloud Sync Client (no need to operate Task Sync Server atm).
Anachron 
@snonux why do you need to send out emails from it? Can't you just send an email with the event attached?
I synchronize caldav with vdirsyncer.
On Android I use "Tasks", on Linux I wrote my own shell scripts (most would use something like todoman I guess).
@Anachron Yes, some rudimentary E-Mail would be good! For now, I use Taskwarrior on my Linux laptop, and I sync my Taskwarrior DB to my OpenBSD VM , where I have a line in my daily.local script, which gets executed once daily and presents me upcoming events via the daily output E-Mail! That's enough for me :-) :-) #kiss
I could also use NextCloud cal, and get notifications to my GNOME desktop when an event happens. That might be more convenient, but I like to tinker for fun :-).