Tour Preview

Find the Best Demos and Examples

Check out this quick tour to find the best demos and examples for you, and to see how the Felgo SDK can help you to develop your next app or game!

Licenses Used in Qt

Qt contains some code that is not provided under the GNU Lesser General Public License (LGPL) or the Qt Commercial License, but rather under specific licenses from the original authors.

The Qt Company gratefully acknowledges these and other contributions to Qt. We recommend that programs that use Qt also acknowledge these contributions, and quote these license statements in an appendix to the documentation.

Note: You only need to comply with (and acknowledge) the licenses of the third-party components that you are using with your application. Click the name of the component to see the licensing details.

Third-party Licenses

The following table lists parts (modules) of Qt that incorporate code licensed under third-party open-source licenses:

Qt 3D

Open Asset Import Library

BSD 3-clause "New" or "Revised" Licensee

Qt Bluetooth

BlueZ

GNU General Public License v2.0 only (This does not force user code to be GPL'ed. For more info see details.)

Qt Core

Data Compression Library (zlib)

ZLib license

Easing Equations by Robert Penner

BSD 3-clause "New" or "Revised" License

Efficient Binary-Decimal and Decimal-Binary Conversion Routines for IEEE Doubles

BSD 3-clause "New" or "Revised" License

FreeBSD strtoll and strtoull

BSD 3-clause "New" or "Revised" License

MD4

Public Domain

MD5

Public Domain

PCRE2

BSD 3-clause "New" or "Revised" License

QEventDispatcher on macOS

BSD 3-clause "New" or "Revised" License

Secure Hash Algorithm SHA-1

Public Domain

Secure Hash Algorithm SHA-3 - Keccak

Creative Commons Zero v1.0 Universal

Secure Hash Algorithm SHA-3 - brg_endian

BSD 3-clause "New" or "Revised" License

Secure Hash Algorithms SHA-384 and SHA-512

BSD 3-clause "New" or "Revised" License

Text Codec: EUC-JP

BSD 2-clause "Simplified" License

Text Codec: EUC-KR

BSD 2-clause "Simplified" License

Text Codec: GBK

BSD 2-clause "Simplified" License

Text Codec: ISO 2022-JP (JIS)

BSD 2-clause "Simplified" License

Text Codec: Shift-JIS

BSD 2-clause "Simplified" License

Text Codec: TSCII

BSD 2-clause "Simplified" License

Text Codecs: Big5, Big5-HKSCS

BSD 2-clause "Simplified" License

The Public Suffix List

Mozilla Public License 2.0

Unicode Character Database (UCD)

Unicode License Agreement - Data Files and Software (2016)

Unicode Common Locale Data Repository (CLDR)

Unicode License Agreement - Data Files and Software (2016)

forkfd

MIT License

Qt D-Bus

libdus-1 headers

Academic Free License v2.1, or GNU General Public License v2.0 or later

Qt GUI

ANGLE Library

BSD 3-clause "New" or "Revised" License

ANGLE: Array Bounds Clamper for WebKit

BSD 2-clause "Simplified" License

ANGLE: Murmurhash

Public Domain

ANGLE: Systeminfo

BSD 2-clause "Simplified" License

ANGLE: trace_event

BSD 3-clause "New" or "Revised" License

Anti-aliasing rasterizer from FreeType 2

Freetype Project License or GNU General Public License v2.0 only

Cocoa Platform Plugin

BSD 3-clause "New" or "Revised" License

Freetype 2

Freetype Project License or GNU General Public License v2.0 only

Freetype 2 - Bitmap Distribution Format (BDF) support

MIT License

Freetype 2 - Portable Compiled Format (PCF) support

MIT License

Freetype 2 - zlib

Zlib License

HarfBuzz

MIT License

HarfBuzz-NG

MIT License

IAccessible2 IDL Specification

BSD 3-clause "New" or "Revised" License

LibJPEG-turbo

Independent JPEG Group License

LibPNG

Libpng License

Native Style for Android

Apache License 2.0

OpenGL ES 2 Headers

MIT License

OpenGL Headers

MIT License

Pixman

MIT License

Smooth Scaling Algorithm

BSD 2-clause "Simplified" License and Imlib2 License

Vulkan API Registry

MIT License

Wintab API

Public Domain

XCB

MIT License

sRGB color profile icc file

International Color Consortium License

xkbcommon

MIT Licenses (with no-advertisement clause)

Qt Image Formats

JasPer

JasPer License

MNG reference library

Zlib License

TIFF Software Distribution (libtiff)

Libtiff License

WebP (libwebp)

BSD 3-clause "New" or "Revised" License

Qt Location

Boost

Boost Software License 1.0

CSS Color Parser

MIT License

Clip2Tri Polygon Triangulation Library

MIT License

Clipper Polygon Clipping Library

Boost Software License 1.0

Earcut

ISC License

Earcut Polygon Triangulation Library

ISC License

Mapbox GL Native

BSD 2-clause "Simplified" License

Poly2Tri Polygon Triangulation Library

BSD 3-clause "New" or "Revised" License

RapidJSON

MIT License

Vector Tile Library

ISC License

Wagyu Geometry Processing Library

MIT License

cURL Parse Date

MIT License

geojson-cpp

ISC License

geojson-vt-cpp

ISC License

geometry.hpp

ISC License

kdbush.hpp

ISC License

libc++

MIT and UIUC (BSD-like)

polylabel

ISC License

protozero

BSD 2-clause "Simplified" License

shelf-pack-cpp

ISC License

supercluster.hpp

ISC License

tao_tuple

MIT License

unique_resource

Boost Software License 1.0

variant

BSD 3-clause "New" or "Revised" License

Qt Purchasing

Base64 Decoder

Apache License 2.0

In-app billing service

Apache License 2.0

Public Key Verification

Apache License 2.0

Qt QML

JavaScriptCore Macro Assembler

BSD 2-clause "Simplified" License

Qt Quick Controls 2

Qt SQL

SQLite

Public Domain

Qt SVG

XSVG

MIT "Old Style" License

Qt Script

JavaScriptCore

GNU Library General Public License v2 or later

Qt Test

Cycle

MIT License

Linux Performance Events

GNU General Public License v2.0 only with Linux Syscall Note

Valgrind

BSD 4-clause "Original" or "Old" License

Qt Virtual Keyboard

Lipi Toolkit

MIT License

OpenWnn

Apache License 2.0

PinyinIME

Apache License 2.0

Traditional Chinese IME (tcime)

Apache License 2.0 and BSD 3-clause "New" or "Revised" License

Qt XML Patterns

XML Schema

W3C Software Notice and Document License (2015-05-13)

Additional Information

The following table lists related documents, such as information about Trademarks and other licenses used in parts of Qt.

Android GNU C++ Run-time Licensing

Provides additional information about the licensing of run-time dependencies of Qt for Android

LLVM Attribution

University of Illinois/NCSA Open Source License, BSD licenses

License Changes

Information about changes of licenses in Qt and Third Party Modules

Macros for Building with CMake

BSD 3-clause "New" or "Revised" License

Mesa llvmpipe

MIT License

Notes about PDF Licensing

Details of restrictions on the use of PDF-related trademarks

Open Source Licensing of Qt

Information about open source licensing of Qt.

The Active Qt framework

Commercial and BSD 3-clause "New" or "Revised" License.

The qtmain Library

Commercial and BSD 3-clause "New" or "Revised" License.

Trademarks

Information about trademarks owned by The Qt Company and other organizations.