Conexio Technologies' Stratus is an open source LTE-M/NB-IoT Cellular-IoT development kit based around Nordic Semi nRF9160. Stratus can charge battery from solar power & comes with 500 MB global data plan. Stratus will be available on Crowd Supply.
Jupiter Nano is a high-performance embedded microprocessor development board that can run Linux and is based on Microchip's ATSAMA5D27C-LD1G. Nano is an open source project created by Adam Feuer from Starcat LLC.