The Trinity Desktop Environment is a complete software desktop environment designed for Unix-like operating systems, intended for computer users preferring a traditional desktop model, and is free/libre software.
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Pro Traditional desktop experience
As a fork of KDE 3.5 Trinity is designed for Unix-like operating systems, intended for computer users preferring a traditional desktop model.
Pro Highly configurable
Trinity is every customizable, almost every aspect of the GUI can be changed to look like you want. Need a button in the toolbar? You can add it. You want a specialized toolbar in a certain part of the screen? You can add it.
You can configure the GUI in the setup before the first run too.
Pro Works fine on old computers
It is very responsive in 7+ years old computers
Con Huge and obsolete codebase
Trinity is based in Qt 3, which is unmaintained by upstream. The KDE 3 codebase is also unmaintained. As new technologies like Systemd become a new standard the lack of developers make Trinity more incompatible and error/bug/security risk prone.