| RT-Thread | Real Time Operating System porting for Arduino SAM and SAMD boards |
| RTT-CMSIS-OS | RT-Thread CMSIS RTOS2 |
| RTT-Ethernet | RT-Thread Ethernet driver |
| RTT-GUI | Embedded GUI Library |
| RTT QRCode | RT-Thread QR Code App |
| wolfssl | wolfSSL Embedded SSL/TLS Library for Arduino |