In the past few years, we have covered plenty of fancy Nixie Tube clocks here. The Zifra is also worth a look. It is a single digit Nixie tube WiFi clock with an IN-12B Nixie tube. It connects to the internet and uses NTP to get the time.
This WiFi clock has a 3D printed body. Its tube is driven by an esp8266 ESP-01 module. It uses a 5V power supply. More information is available here.