Another thing I hated is the online installer. PhotoJoy do not have an option for offline installer. PhotoJoy is absolutely free and comes from Incredimail Ltd. Passionate about photography.

QGIS in OSGeo4W:

• OSGeo4W Network Installer (64 bit)

• OSGeo4W Network Installer (32 bit)

In the installer choose Desktop Express Install and select QGIS to install the latest release.
To get the long term release (that is not also the latest release) choose Advanced Install and select qgis-ltr-full
To get the bleeding-edge development build choose Advanced Install and select qgis-dev-full

Standalone installers from OSGeo4W packages

Latest release (richest on features):

• QGIS Standalone Installer Version 3.12 (64 bit)

• QGIS Standalone Installer Version 3.12 (32 bit)

Long term release repository (most stable):

• QGIS Standalone Installer Version 3.10 (64 bit)

• QGIS Standalone Installer Version 3.10 (32 bit)

Official All-in-one, signed installers

Mac Installer Packages for macOS High Sierra (10.13) and newer.

Latest release (richest on features):

• QGIS macOS Installer Version 3.12

Long term release (most stable):

• QGIS macOS Installer Version 3.10

Alternative build

Mac Installer Packages for macOS El Capitan (10.11) and newer.

Installation instructions are in the Read Me on the disk image. These packages use the python.org Python 3, version 3.6, the 'macosx10.9' build - other distributions are not supported. Install Python before installing QGIS.

Additional GDAL format plugins and PROJ grids are available at kyngchaos.com.

• macOS Installers

For many flavors of GNU/Linux binary packages (rpm and deb) or software repositories (to add to your installation manager) are available. Please select your choice of distro below:

The QGIS experience does not stop on the desktop. Various touch optimized apps allow you to take QGIS into the field

Third-party touch optimized apps

QField for QGIS (formerly QGIS for Android)

Input (available for Android, iOS and Windows devices)

IntraMaps Roam

QGIS for Android

An old and deprecated not touch optimised release of QGIS for Android can be found inAll downloads Dolby digital plus driver 7.5.1.1.

All downloads

More specific instructions about downloading QGIS stable vs QGIS development can be found in All downloads.

Datasets

For testing and learning purposes, a sample dataset is available, which contains collections of data from different sources and in different formats.

Previous releases of QGIS are still available here - including older releases for OS X here.

More older releases are available here and for OS X here.

Plugins for QGIS are also available here.

QGIS is open source software available under the terms of the GNU General Public License meaning that its source code can be downloaded through tarballs or the git repository.

QGIS Source Code is available here (latest release) and here (long term release)

Refer to the INSTALL guide on how to compile QGIS from source for the different platforms: here

Note that you can also install the development version (nightly) via an installer from the normal downloads for your platform: here

Plugins for QGIS are also available here.