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    • Obsolete Source 1 Engine On Modern PC
      C++
      Other
      933310Updated Jun 30, 2025Jun 30, 2025
    • A GitHub Action to facilitate configuring MASM (Microsoft Macro Assembler) in the workflow PATH to use x86 or x64 assembly in Win32 applications.
      TypeScript
      MIT License
      2000Updated Jun 30, 2025Jun 30, 2025
    • Source physics engine restored from assembly
      Rich Text Format
      31700Updated Jun 17, 2025Jun 17, 2025
    • libpng

      Public
      LIBPNG: Portable Network Graphics support, official libpng repository
      C
      Other
      706000Updated May 31, 2025May 31, 2025
    • stb

      Public
      stb single-file public domain libraries for C/C++
      C
      Other
      7.9k000Updated May 31, 2025May 31, 2025
    • speex

      Public
      Speex voice codec mirror - THIS IS A MIRROR, DEVELOPMENT HAPPENS AT https://gitlab.xiph.org/xiph/speex
      C
      Other
      166000Updated May 31, 2025May 31, 2025
    • snappy

      Public
      A fast compressor/decompressor
      C++
      Other
      1k000Updated May 31, 2025May 31, 2025
    • Lua

      Public
      CMake based build of Lua (5.4.6 and 5.3.3)
      C
      64000Updated May 31, 2025May 31, 2025
    • Main libjpeg-turbo repository
      C
      Other
      1.1k000Updated May 31, 2025May 31, 2025
    • SDL

      Public
      Simple Directmedia Layer
      C
      zlib License
      2.2k000Updated May 31, 2025May 31, 2025
    • DirectXMath is an all inline SIMD C++ linear algebra library for use in games and graphics apps
      C++
      MIT License
      251000Updated May 31, 2025May 31, 2025
    • protobuf

      Public
      Protocol Buffers - Google's data interchange format
      C++
      Other
      16k001Updated May 19, 2025May 19, 2025
    • Standalone shadercompile, that doesn't depend on valve libraries and supports x64
      C
      15000Updated May 5, 2025May 5, 2025
    • vpc

      Public
      Valve Project Creator is a tool to generate build systems for Visual Studio, Xbox 360, PlayStation 3, Xcode and Make.
      C++
      Other
      2600Updated May 1, 2025May 1, 2025
    • minimp3

      Public
      Minimalistic MP3 decoder single header library
      C
      Creative Commons Zero v1.0 Universal
      229000Updated Mar 27, 2025Mar 27, 2025
    • celt

      Public
      Mirror of git://git.xiph.org/celt.git
      C
      Other
      2000Updated Mar 14, 2025Mar 14, 2025
    • zip-utils

      Public
      Zip Utils - clean, elegant, simple zipper
      C++
      0000Updated Jan 23, 2025Jan 23, 2025
    • NVidia triangle stripper library
      C++
      Other
      0000Updated Jan 23, 2025Jan 23, 2025
    • C++
      GNU General Public License v3.0
      0000Updated Jan 19, 2025Jan 19, 2025
    • bzip2

      Public
      bzip2 is a freely available, patent free (see below), high-quality data compressor. It typically compresses files to within 10% to 15% of the best available techniques (the PPM family of statistical compressors), whilst being around twice as fast at compression and six times faster at decompression.
      C
      Other
      1000Updated Jan 16, 2025Jan 16, 2025
    • 7zip

      Public
      7-Zip
      C++
      146000Updated Jan 13, 2025Jan 13, 2025
    • SpeedTree

      Public
      C++
      0000Updated Jan 10, 2025Jan 10, 2025
    • zlib

      Public
      A massively spiffy yet delicately unobtrusive compression library.
      C
      Other
      2.6k000Updated Nov 30, 2024Nov 30, 2024
    • cryptopp

      Public
      free C++ class library of cryptographic schemes
      C++
      Other
      1.6k000Updated Nov 30, 2024Nov 30, 2024
    • openvr

      Public
      OpenVR SDK
      C++
      BSD 3-Clause "New" or "Revised" License
      1.3k000Updated Aug 1, 2024Aug 1, 2024
    • .github

      Public
      Small collective of Source 1 modders
      0000Updated Jan 7, 2024Jan 7, 2024