Gnome Clocks - Clock application designed for GNOME 3
Z-Cron - With Z-Cron scheduler you can start and/or quit programs (*.exe, *.com, *.bat) under Windows. Freeware software for automation task service on your system.
KTimer - KTimer is a little tool to execute programs after some time.
System Scheduler - System Scheduler for Windows, Free Task Scheduler Software replace Microsoft Windows Task Scheduler
Talalarmo - Minimalistic android alarm
RoboIntern - An automation and scheduling software with focus on repetitive office tasks.