Airfoil - This software is from the Rogue Amoeba company, built to run on Mac and Windows platforms. It’s an audio-based software that allows the computers sound to play over a network device. Read more about Airfoil.
Countdown Screensaver - A Mac screensaver for counting down to a date 🖥🕐
AudioRelay - Listen to your PC audio, use your phone as a mic or stream audio from your phone
Timetaco - Create your own countdowns, as easy as 3, 2, 1
SoundWire - SoundWire does audio mirroring (audio cast). You can use any music player on your PC or laptop like Spotify, YouTube, or iTunes and stream low-latency live sound over WiFi directly to your Android device.
Days App - A beautiful countdown app to the events that matter to you.