Mongoose OS is open source and dual-licensed

Mongoose OS Community Edition
FREE
License: Apache 2.0
Over-The-Air Update (OTA): Limited to mDash IoT backend only
Support: Community Support only
Mongoose OS Enterprise Edition
PAID
License: Commercial
Over-The-Air Update (OTA): Unrestricted, run from any IoT Cloud
Support: Commercial Support available
Mongoose OS quick facts:
* Developed since 2013
* GitHub Stars > 1,790
* Commits > 4,320
* Releases > 64

Mongoose OS Enterprise Edition Pricing

Volume
One-off License Fee per unit, USD
1
$2.09
10
$1.89
50
$1.69
100
$1.49
250
$1.29
500
$1.09
>1000
$0.89
or less, volume based
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Technical Support, Integration Services and Consultancy available