13cm
There are 2 repositories under 13cm topic.
sh123/nrf24l01_arduino_kiss_modem
Arduino Amateur Radio NRF24L01 2.4 GHz USB serial KISS TNC (terminal node controller) for AX25 packet networks
sh123/openwrt-b43-amateur-radio-mods
HSMM OpenWRT backfire 10.03 b43 (WRT54G) patches to make it work on 13 cm amateur band (channel 0, 2407 MHz)