FreeRTOS

hardware

A real-time operating system kernel for embedded devices, now maintained under the MIT licence by Amazon Web Services

Pronunciation

Correct

free-R-T-O-S

/friː ɑːr tiː oʊ ɛs/

The 'Free' part is spoken as a word; the 'RTOS' suffix is spelled out as individual letters.

Source: www.freertos.org(official spec)

Accepted Variant

free-ar-toss

/friː ˈɑːrtɒs/

Some engineers pronounce the RTOS portion as 'ar-toss', treating it as a word.