A little experiment. Meanwhile many have posted their designs, but they are hard to find? I know there are many, many more. This is a wiki post; anyone can edit, so don’t reply but add/update/remove yours:
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ESP8266 WeMos Shield for microchip LORAWAN RN2483 or RN2903 by @Charles
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Laird LoRa/Bluetooth Low Energy Module breakout for RM1xx modules by @Charles
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NodeMcu RFM95w TTN node with Battery charger (forum discussion) by @ccadic
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STM32 / RFM95 board TTN-Labs article by @tomtor
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LoraWAN-Stick, combining Atmega32u4, MTK3339 GPS module, and RN2903 by @brandonbyrne
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Small board with Arduino+RFM95+MOSFET, fits on breadboard by @Oliv
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Raspberry PI Lora Gateway/Node for RFM92/95/96/98/69HCW Modules by @Charles