I cannot tackle every existing or existed device, sorry. You cannot find here products aimed at enterprises and professionals, like the StarVROne, the Varjo VR-3 or the XTAL. For historical reasons, let me mention on the fly the first pioneering headset implementing eye tracking and foveated rendering, the FOVE 0, by Japanese company Fove. Initially welcomed by a successful international kickstarter campaign in... Source: about 3 years ago

I use: tomato-timer.com, and I use the basic 25/5 or 25/10 for a longer rest. I set the bell tone I want and tell it to go continuously (that's "auto start" under settings). I get myself ready, close out wasting time tabs, open my document, make sure I have my water by my side, and press "start." Then I do my 5 or 6 sprints and usually am done for the day. Source: about 1 year ago

There is a "Tomato Timer". [1] Looks like it was bought recently. [1] https://tomato-timer.com/. - Source: Hacker News / over 1 year ago

Adderall and https://tomato-timer.com/ . Source: about 2 years ago

Here this might help you https://tomato-timer.com/. Source: about 2 years ago

Here’s a website with a timer too in case you don’t wanna use an app. Source: about 2 years ago