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Ruby MRI
CrunchBang Linux
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Csound
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CubePDF
CUBRID
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CUPS
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CyanogenMod
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Cygwin/X
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Cyrus IMAP server
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Das U-Boot
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DD-WRT
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Debian Almquist shell
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DesktopBSD
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DigiKam
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Docker
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Dolphin (file manager)