Hachoir

GNU libextractor   (Compare Project)

Mostly written in Postscript

License: gpl3_or_later

XBUP - Extensible Binary Universal Protocol   (Compare Project)

Mostly written in Java

License: gpl3_or_later, lgpl3

Pygame   (Compare Project)

Mostly written in Python

License: lgpl

yml   (Compare Project)

License: gpl

FUSE   (Compare Project)

Mostly written in C

License: gpl, lgpl

OpenELEC - Media Center Operating System   (Compare Project)

Mostly written in C

License: gpl

Qt 5   (Compare Project)

Mostly written in C++

License: Commercial, GNU_Free_Documentation_License, gpl3, lgpl21

PureData   (Compare Project)

Mostly written in C++

License: BSD-3-Clause, gpl

OpenTK   (Compare Project)

Mostly written in C#

License: mit

CLAM   (Compare Project)

License: gpl