What programs are available for recurring reminders (Linux, Web)?

Question

Software and Internet Services

I write for PC. There is a great desire to do exercises every half an hour. You need a program for Ubuntu or a web application or an extension (for Chrome), which (e) from the set time will give a signal once every half an hour (something like a dog will bark or a bell will chime a couple of times).

Answer 1

Answer 2

Any kitchen timer is the same =)
In general, under Chrome there are a bunch of related applications. I like OmniboxTimer .

Answer 3

Workrave, I have it constantly running.