The new 2021 version is still based on the original BrickStore from 2005, but was modernized in every regard.
Installers for all supported platforms are now freely available on GitHub - see below for more information.

Windows (German) Windows (German)
macOS (French) macOS (French)
Linux (English) Linux (English)

Download

Everything is hosted on GitHub (the hosting provider for open-source projects):

About

BrickStore is a BrickLink offline management tool. It is multi-platform (Windows, macOS and Linux), multilingual (currently English, German and French), fast and stable.

Some things you can do with BrickStore much more efficiently than with any web based interface:

Documentation

BrickStore doesn’t come with a complete documentation, but most everything has tool-tips: just hover over an element and you’ll get a short description. There’s also a page with tutorials.

Requirements

BrickStore works on every Windows 32-bit and 64-bit operating system (7, 8.1 and 10), macOS (10.12 or newer) and Linux (packages are available for Ubuntu 20.04). If you want to (or need to) compile BrickStore yourself, then the only requirement is, that the Qt library you are building against has to be at least version 5.12).

License

BrickStore is copyrighted ©2004-2021 by Robert Griebl, licensed under the GNU General Public License (GPL) version 2. All data from www.bricklink.com is owned by BrickLink. Both BrickLink and LEGO are trademarks of the LEGO group, which does not sponsor, authorize or endorse this software. All other trademarks recognized.

Only made possible by Dan Jezek’s support

3rd-Party Components

This projects contains 3rd-party components under different licenses: