Qubes OS · postmarketOS

What it's for

Two niche systems: Qubes compartmentalises your PC into sealed virtual machines; postmarketOS runs Linux on old phones.

Why it matters

Qubes isolates each activity (work, banking, risky browsing) in its own compartment: a compromise doesn’t reach the rest. postmarketOS extends the life of phones abandoned by their maker.

For whom & when Expert users with a very high threat model.