
Description: KaiOS is a mobile operating system based on Linux that is designed for feature phones and low-end smartphones. It enables some smartphone-like capabilities on affordable devices, including apps, 4G LTE, GPS, and Wi-Fi support.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: postmarketOS is a Linux distribution aimed at bringing newer Linux versions to older Android devices. It allows using more recent applications on devices that are no longer officially supported by vendors.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API