Manage events on a Google Calendar
A complete Getting Things Done (GTD) productivity system for desktop a
XartNote is a diary, note and journal tool.
Outliner and time organizer for todo lists, events or scheduling tasks
Manage events and tasks using simple text files.
PIM/shcedular
A small calender with TUI for Linux
A personal Getting-Things-Done extension for MSOutlook and MSOneNote.
Uniwits Online Reservation System