Similar to Geant4
Open Babel
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OpenCV
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OpenJDK
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OpenOffice.org
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OpenSceneGraph
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PCSX2
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Phonon
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PLUMED
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Poppler
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PPSSPP
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PyQt
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QBittorrent
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QGIS
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Qt
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Radium (ソフトウェア)
ReactOS
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Rosegarden
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