Similar to GThumb

GNU arch

Asymptote (vector graphics language)

Asterisk (PBX)

Amaya (web editor)

ImageMagick

Vim (text editor)

ARToolKit

MPlayer

OpenMM

Audacity (audio editor)

Oniguruma

CURL

Cairo (graphics)

Git

Xine

Compiz

Samba (software)

GGPO

CinePaint

Shadowsocks

Squirrel (programming language)

Skencil

SPICE

Dovecot (software)

Tesseract (software)

Tor (network)

Dokan Library

Perl