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        Letter: H
        
          - 
            HelixPlayer - 
            Open source media player based on the Helix framework
          
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            Hermes - 
            Pixel format conversion library
          
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            HippoDraw - 
            Interactive and Python scriptable data analysis application
          
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            hackedbox - 
            The bastard son of Blackbox, a small and fast Window Manager
          
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            haddock - 
            Haddock documentation tool for annotated Haskell source code
          
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            halberd - 
            Tool to discover HTTP load balancers
          
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            hamlib - 
            Run-time library to control radio transceivers and receivers
          
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            happy - 
            The LALR(1) Parser Generator for Haskell
          
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            haproxy - 
            HA-Proxy is a TCP/HTTP reverse proxy for high availability environments
          
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            hardinfo - 
            System Profiler and Benchmark
          
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            harminv - 
            Program and library for solving the harmonic inversion problem
          
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            hatari - 
            An Atari ST emulator suitable for playing games
          
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            hawknl - 
            Game oriented network library
          
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            hddtemp - 
            Hard disk temperature tool
          
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            hdf - 
            A general purpose library and file format for storing scientific data
          
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            hdf5 - 
            A general purpose library and file format for storing scientific data
          
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            hdhomerun - 
            HDHomeRun configuration utility
          
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            heartbeat - 
            Heartbeat subsystem for High-Availability Linux
          
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            heliodor - 
            Beryl window decorator with Metacity theme support
          
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            help2man - 
            Create simple man pages from --help output
          
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            hercules - 
            Hercules S/370, ESA/390, and z/Architecture emulator
          
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            hevea - 
            LaTeX to HTML translator
          
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            hexter-dssi - 
            DSSI software synthesizer plugin emulating DX7
          
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            hfsplus-tools - 
            Tools to create/check Apple HFS+ filesystems
          
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            hfsplusutils - 
            Tools for reading Macintosh HFS+ volumes
          
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            highlight - 
            Universal source code to formatted text converter
          
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            hmmer - 
            Profile HMM software for protein sequence analysis
          
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            hnb - 
            Hierarchical Notebook
          
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            homebank - 
            Free easy personal accounting for all
          
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            horde - 
            The common Horde Framework for all Horde applications
          
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            hpic - 
            Healpix manipulation binaries and library
          
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            hping3 - 
            TCP/IP stack auditing and much more
          
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            hspell - 
            A Hebrew spell checker
          
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            ht2html - 
            The www.python.org Web site generator
          
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            html-xml-utils - 
            A number of simple utilities for manipulating HTML and XML files
          
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            html401-dtds - 
            HTML 4.01 document type definitions
          
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            htmldoc - 
            Convert HTML source files into HTML, PostScript, or PDF
          
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            htop - 
            Interactive process viewer
          
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            http_ping - 
            HTTP latency measuring utility
          
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            hugin - 
            Frontend for Panorama Tools, similar to PTAssembler, PTGui or Open for Windows
          
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            hugs98 - 
            Haskell Interpreter
          
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            hunky-fonts - 
            Modified Bitstream Vera fonts with additional letters
          
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            hunt - 
            Tool for demonstrating well known weaknesses in the TCP/IP protocol suite
          
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            hydrogen - 
            Advanced drum machine for GNU/Linux
          
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            hyperestraier - 
            A full-text search system