GNOME

KDE   (Compare Project)

Mostly written in C++

License: GNU_General_Public_License_v2_0_only, gpl3, lgpl21, lgpl3

Liri   (Compare Project)

Mostly written in C++

License: Unknown

Hawaii   (Compare Project)

Mostly written in C++

License: BSD-3-Clause, gpl, lgpl21_or_later, mit

Razor-qt   (Compare Project)

Mostly written in TypeScript

License: gpl, lgpl21_or_later

LXDE   (Compare Project)

License: gpl, lgpl

KDElibs (KDE)   (Compare Project)

Mostly written in C++

License: lgpl

X Desktop Environment   (Compare Project)

Mostly written in C

License: Unknown

awesome   (Compare Project)

Mostly written in Lua

License: gpl

Unagi Compositing Manager   (Compare Project)

License: gpl3_or_later

Clutter Toolkit   (Compare Project)

Mostly written in C

License: lgpl21_or_later