Break Reminder for Ubuntu?

Safe Eyes

Here is another tool for the same purpose:

sudo apt install safeeyes

Alternatively, you can install it from the PPA:

sudo add-apt-repository ppa:slgobinath/safeeyes
sudo apt-get update
sudo apt-get install safeeyes

Safe Eyes Short Break Screen

Features:

Short breaks with eye exercises
Long breaks to change physical position and to warm up
Strict break for those who are addicted to computer
Do not disturb when working with fullscreen applications( Eg: Watching movies)
Disable the keyboard during break
Notifications before every break
Support multiple displays
Pause automatically if the system is idle
Optional audible alert at the end of breaks
Multi-language support

For more details https://github.com/slgobinath/SafeEyes

Take A Break

Last update 2015-12-05.

sudo add-apt-repository ppa:vlijm/takeabreak
sudo apt-get update
sudo apt-get install takeabreak

Home site
Article on webupd8

Workrave

Ubuntu comes with a Workrave package. You can install it from the command line with the following command:

sudo apt-get install workrave

If you need a newer version than what is included in your distribution, use the official Workrave PPA.

The Workrave PPA can be enabled by entering these commands into a terminal:

sudo add-apt-repository --yes ppa:rob-caelers/workrave
sudo apt update
sudo apt install workrave

Xwrits

A similar program, but thought for wrist care, is Xwrits, also available from the Software Centre.

Last update: 2009-04-03

Stretchly

Stretchly is an open-source break-taking app that is pretty customizable.

screenshot

You have several installation options like Flatpack, appimage or with snap

snap install stretchly

GNOME Break Timer

Break Timer keeps track of how much you are using the computer.

Just switch it on, and it will remind you to take breaks.

This application is intended as a replacement for drwright, which was included with GNOME 2. GNOME Break Timer is made for GNOME 3, with a status application that follows the new design patterns as well as tight integration with GNOME Shell. It is written in Vala and uses GTK.

Unfortunately I couldn't find any fine and smoothly working software like EyeLeo in Windows. And another built in solution from this link from (2009).