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BrickHub

instructions, mocs +1

Share and explore free LEGO building instructions with generated steps, parts lists, and 3D models.

BrickStore

marketplaces & trading, software & apps +1

A free, open-source BrickLink inventory-management app for working offline, browsing the catalogue, and creating XML for BrickLink Mass-Upload and Mass-Update.

Bricksmith

software & apps, instructions

A free, open-source macOS LDraw editor for building virtual LEGO models and documenting them with steps and submodels.

LDView

software & apps, github

A real-time 3D viewer for displaying LDraw models with hardware-accelerated graphics.

LDraw

software & apps

LDraw is an open file-format standard and 17,000-plus-part library for LEGO CAD, maintained entirely by volunteers.

LPub3D

instructions

LPub3D is a free, open-source WYSIWYG editor that turns LDraw model files into LEGO-style step-by-step instructions.

LeoCAD

software & apps

LeoCAD is a free, open-source LDraw-standard CAD app for virtual LEGO building, running natively on Windows, Linux and macOS.