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This is an nice application using Annex and its internal support for the MAX7219 dot matrix display.
The design is based on the original project that can be found here
The case can be just be printed using a 3D printer.
The 3D printer .STL files can be downloaded here
All the instructions on how build the 3D case can be found in the original project.
The software is just annex and few lines of code.
The electrical wiring is the one already present in the documentation
This example shows only the date and the time but it can be modified to show many other information such as weather, news in addition to local information as temperature, humidity, etc.
At the bottom of this page, there is another example that adds the weather information.
The code is very simple
This is the display module to be installed in the case.
It can be found easily on ebay at around than 5€
The ESP8266 is a Wemos Mini available on ebay at around 3€
The wiring is done using the SPI bus plus a dedicated CS pin.