Osmo is a personal organizer, which includes calendar, task manager and address book modules.
It aims to be easy to use and configurable to meet the user’s preferences, and runs particularly well on smaller monitors. It sports a neat and compact interface.
Osmo is a GTK+ based tool which uses a plain XML database to store all personal data.
Key Features
- General:
- Compact interface.
- Configurable GUI layout (horizontal/vertical).
- Encrypted private data backup.
- Calendar:
- Day notes with text attributes (italic, bold, underline, etc.)
- Date calculator.
- Built-in full year calendar.
- Compact mode.
- Auxiliary calendars for next and previous month.
- Basic iCalendar support (import/export).
- Integration with Tasks and Contacts modules.
- Tasks:
- Advanced reminder.
- Alarm actions per task (commands, sounds, etc.)
- Tasks list printing.
- Category filter.
- Due date modification on the fly.
- Basic iCalendar support (export).
- Date dependent task coloring.
- Contacts:
- Robust search functionality.
- Birthdays browser.
- Addresses location on the map using Google Maps.
- Basic import/export filters (csv, xhtml).
- Notes:
- Handy notes selector.
- Category filter.
- Optional encryption using user-defined password.
- Text attributes (italic, bold, underline, etc.)
Website: osmo-pim.sourceforge.net
Support:
Developer: Tomasz Maka, Piotr Mak
License: GNU General Public License v2.0

Osmo is written in C. Learn C with our recommended free books and free tutorials.
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| gsimplecal | Simple and lightweight GTK calendar |
| Osmo | Personal organizer with calendar, task manager and address book |
| Pagume | Ethiopian calendar |
Read our verdict in the software roundup.
| Personal Information Managers | |
|---|---|
| Kontact | Unites mature and proven applications |
| Evolution | Integrated mail, addressbook and calendaring functionality |
| TagSpaces | Offline, open source, personal data manager |
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| Osmo | Includes calendar, task manager and address book modules |
| LXQt Organizer | Lightweight personal organizer for managing events, tasks, and contacts |
Read our verdict in the software roundup.
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it sometimes delete the entries i put during the day… for example, i lost the data i entered yesterday… because i shutdown the computer without closing osmo before? maybe… but it is not sure… it already deleted my entries of the day without having shutdown the computer. 🙂 too bad… 🙁