I create a timer where you can select timer just like you do in your mobile.

WinAPI program to test the internal pc speaker on Windows

Gives off an alarm, when wardrobe door is left open for long

Code for Arduino

Suitable beep loudness level and cut a noise M5Stack Speaker

Triple countdown timer utility (gui for linux), features: auto cycle, window to top, adj beep pitch, ability to execute bash commands.

Create an autonomous car based on Arduino and the subsumption architecture

Library for playing simple sound signals on ESP32

A simple API for Visual C++ that you can use it alongside Sleep() and Beep() Functions to play music notes.

beep_engine is a sound engine written in C++, designed to generate sounds and beep music in a flexible and effective way. The engine offers a number of functions, such as: beepmap, beeplist, beepboard.

Creating music by beep sound in C++

The Beep Library For Arduino