Open-source and free to self-host
QFutureBuilder is for set/ track long time goals.
Custom, simple, timed audio and visual reminders using cron scheduling
Outliner and time organizer for todo lists, events or scheduling tasks
Open Source, tasks, bug tracking, agile scrum, timesheet, wiki
Alarm Clock with a couple of nice extra features. Wake up your way.
Timer with random interval countdown
Web Based Shift Rotation Schedule Management Application
A Simple, easy to use, customizable Alarm Clock