The source code is published under GPLv3 with OpenSSL exception, the license is available here.
- Windows XP - Windows 10 (not RT)
- Mac OS X 10.8 - Mac OS X 10.15
- Mac OS X 10.6 - Mac OS X 10.7 (separate build)
- Ubuntu 12.04 - Ubuntu 19.04
- Fedora 22 - Fedora 30
- Snappy
- Flathub
- Qt 5.3.2 and 5.6.2, slightly patched (LGPL)
- OpenSSL 1.0.1g (OpenSSL License)
- zlib 1.2.8 (zlib License)
- libexif 0.6.20 (LGPL)
- LZMA SDK 9.20 (public domain)
- liblzma (public domain)
- Google Breakpad (License)
- Google Crashpad (Apache License 2.0)
- GYP (BSD License)
- Ninja (Apache License 2.0)
- OpenAL Soft (LGPL)
- Opus codec (BSD License)
- FFmpeg (LGPL)
- Guideline Support Library (MIT License)
- Mapbox Variant (BSD License)
- Range-v3 (Boost License)
- Open Sans font (Apache License 2.0)
- Emoji alpha codes (MIT License)
- Catch test framework (Boost License)
- xxHash (BSD License)