We have recently released the RAK12500, a GNSS module featuring the u-blox ZOE-M8Q module, which truly talks to everybody: not only does it work with GPS, GLONASS, BeiDou and QZSS , it works both with Serial and I2C.
RAK12002 - WisBlock RTC module
The RAK12002 is a Real-Time Clock module with its own battery backup. This module, once set to the correct date and time, will keep the date and time updated even on a power loss. Once the power supply is available again, the WisBlock Core module can receive the correct date and time from the RTC module.