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        Letter: O
        
          - 
            OpenEXR - 
            A high dynamic-range (HDR) image file format
          
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            OpenSceneGraph - 
            High performance real-time graphics toolkit
          
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            obby - 
            A library which provides synced document buffers
          
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            obconf - 
            A graphical configuration editor for the Openbox window manager
          
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            obmenu - 
            A graphical menu editor for Openbox
          
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            ocaml - 
            Objective Caml compiler and programming environment
          
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            ochusha - 
            A GTK+ 2ch.net BBS Browser
          
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            ocsinventory-client - 
            Open Computer and Software Inventory Next Generation client
          
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            ocsinventory-ipdiscover - 
            Open Computer and Software Inventory Next Generation client
          
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            octave - 
            A high-level language for numerical computations
          
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            octave-forge - 
            Contributed functions for octave
          
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            oddjob - 
            A D-BUS service which runs odd jobs on behalf of client applications
          
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            ode - 
            High performance library for simulating rigid body dynamics
          
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            ogdi - 
            Open Geographic Datastore Interface
          
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            ogre - 
            Object-Oriented Graphics Rendering Engine
          
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            oidentd - 
            Implementation of the RFC1413 identification server
          
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            oneko - 
            Cat chases the cursor
          
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            ooo2txt - 
            Convert OpenOffice documents to simple text
          
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            oooqs2 - 
            OpenOffice.org Quickstarter 2
          
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            oorexx - 
            Open Object Rexx
          
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            openal - 
            Open Audio Library
          
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            openalpp - 
            Object Oriented version of OpenAL
          
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            openarena - 
            Open source first person shooter
          
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            openbabel - 
            Chemistry software file format converter
          
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            openbox - 
            A highly configurable and standards-compliant X11 window manager
          
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            opencdk - 
            Provides basic parts of the OpenPGP message format
          
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            openct - 
            Middleware framework for smart card terminals
          
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            opencv - 
            Collection of algorithms for computer vision
          
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            openmpi - 
            Open Message Passing Interface
          
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            openoffice.org-dict-cs_CZ - 
            Czech spellchecker and hyphenation dictionaries for OpenOffice.org
          
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            opensc - 
            Smart card library and applications
          
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            openslp - 
            Open implementation of Service Location Protocol V2
          
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            openvpn - 
            A full-featured SSL VPN solution
          
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            orange - 
            Squeeze out installable Microsoft cabinet files
          
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            ortp - 
            A C library implementing the RTP protocol (RFC3550)
          
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            osgal - 
            Adapts OpenSceneGraph to use OpenAL++
          
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            osgcal - 
            Adapts OpenSceneGraph to use Cal3D
          
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            osiv - 
            Open Source Image Velocimetry
          
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            otrs - 
            The Open Ticket Request System
          
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            ots - 
            A text summarizer
          
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            overgod - 
            Another Asteroid like game