if you can not build it you cant trust it.
Build your own trustable Alpine linux ISO
linux is the kernel gnu is the os plus we have android, busybox, alpine and chrome os.
better to make / bake a browser on your own
FreeRTOS Basic Information,Kernel & Architecture,Version History & Important Milestones,Target Audience & Use Cases
BREW OS (Binary Runtime Environment for Wireless) Latest Official Version BREW 4.0 (around 2007) Early binary app platform for mobile phones — downloadable apps, long before app stores.
CentOS Based On: Upstream source code of Red Hat Enterprise Linux Virtualization ready (KVM, Xen, Docker, Podman
Amoeba Operating System Based On: Designed from scratch for distributed systems research Architecture Support: x86, older UNIX workstation hardware
Android OS Originally Android Originally Android Touch-optimized GUI with home screen, widgets, app drawer
Berkeley Software Distribution Kernel Type: Monolithic kernel with modular subsystems
Master Control Program Kernel Type Stack-oriented OS, process control at hardware level
C64 OS Made up of KERNAL (low-level I/O & drivers), BASIC interpreter, and the screen editor
