Hourglass is described as 'The most advanced simple countdown timer for Windows. Just enter a time in just about any format, and hit Enter' and is a popular Time Tracking tool in the office & productivity category. There are more than 100 alternatives to Hourglass for a variety of platforms, including Mac, Windows, iPhone, Android and iPad apps. The best Hourglass alternative is Pomatez, which is both free and Open Source. Other great apps like Hourglass are Floating Timer, Countdown Timer Pro, SnapTimer and Micro Timer.
Pomatez is a multi-platform desktop application designed for individuals who utilize the Pomodoro technique. The application offers a range of features that can be customized according to user preference, including the ability to modify the default Pomodoro configuration.
The Floating Timer app features both a countdown timer and stopwatch that will float on top of other running apps. This app is useful to time activities such as: Exam practice, gaming speed runs (speed-running), gaming boss fights, cooking.
Create highly customizable countdown timer overlays with ease. It's the perfect tool for work sessions, focus sprints, event timing, or simply keeping track of time visually.
All the timers I tested were too complex for my taste. I decided to write one that was dead simple, so you could run it, type in a time and hit enter. The aim of SnapTimer is to get out of the way and help you be productive.
Micro Timer is a tiny, microwave-inspired timer app for Android. Instead of inventing yet another clever, pretty, tedious method of inputing time, Micro Timer uses the tried-and-true 10-key pad commonly found on microwave ovens.
Gestimer - For those little reminders during the day. Drag & drop to quickly create reminders with this beautifully designed menu bar app for your Mac.
MinuteTick helps you stay on track by letting you set notifications for specific minutes of each hour.
Free Countdown Timer is a free, full-featured and user-friendly countdown timer for Windows
WatchMe is a free (premium available) simple timer program to time a number of different tasks or events together or independently of each other.
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I was looking for an Hourglass alternative , I found one and add here. Custom sound is not yet set but anyway, its UI worth it !