XFree86

X.Org   (Compare Project)

Mostly written in C

License: BSD-3-Clause, mit

alock   (Compare Project)

License: mit

VcXsrv Windows X Server   (Compare Project)

Mostly written in C

License: gpl3

Matchbox   (Compare Project)

Mostly written in C

License: Unknown

The MirOS Project   (Compare Project)

License: apache, artistic_gpl, Beerware, bsd_2clause_ish, BSD-3-Clause, BSD-3-Clause, bsd, gpl, MirOS, mit, XFree86_Project_Licence_version_1_1, zlib_libpng

XonX   (Compare Project)

License: Unknown

GTK   (Compare Project)

Mostly written in C

License: lgpl21_or_later

Simple DirectMedia Layer   (Compare Project)

Mostly written in C

License: zlib_libpng

Compiz Reloaded   (Compare Project)

Mostly written in C

License: gpl, lgpl, mit

Cairo   (Compare Project)

Mostly written in C

License: lgpl, mozilla_public_1_1