Q4OS is a Debian-based desktop Linux distribution offering a choice of a classic-style user interface (Trinity) and a modern desktop environment (KDE Plasma). The project also develops various utilities, such as Desktop Profiler and Software Center, as well as installers for third-party applications.

• Q4OS 6.1
• Q4OS 5.8
• Q4OS 5.6
• Q4OS 5.2
• Q4OS 4.10

Really like Q4OS, but the last two versions of Plasma have a bug in the screenlock. It will randomly Fail to show a box for the password when you attempt to wake the computer, and nothing seems to remedy it short of a hard reboot. Upgraded the memory to 16 GBs but it failed to solve the problem.