Mater is a very simple menubar Pomodoro app. It's written in Electron and there are binaries for Mac, Windows, and Linux.
I've used a bunch of Pomodoro apps in the past and never found found one that hit the sweet spot for simplicity and nice design. When I found myself wanting to learn Electron, I decided to scratch both itches at the same time!
Just Focus is a clean and simple app to help you improve your productivity. It's now available on iOS and macOS.
Chronos is a simple and powerful tool that lets you manage your time more efficiently and in a systematic way which ensures maximum productivity. Time management can often prove tricky for some, so using a time management tool like Chronos will help you ease the situation.
Tomatoid is 3v1:
Simple yet extremely customizable. Change time intervals, set alarms or ticking sound.
Just hit play and start working. Pause the timer anytime you need to make a phone call.
Create to-dos and categorize them. Assign priority. Set due date.
Available for Web, iOS & Android.
Pomodoro Tasks is an easy-to-use todo and pomodoro timer app with features of task management per project, built-in pomodoro timer, data sync over devices, offline capability, and mobile support.
This app is available totally for free and also open source. When you have any issues using it, please file it on its GitHub page. Thank you!