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Bricksafe

mocs, instructions

A free LEGO-only file-hosting site from Rebrickable's creators for photos, PDFs, CAD files, and building instructions; a 2025 creator statement says new registrations are disabled.

Brickshelf

mocs, instructions

Browse a long-running public gallery of LEGO fan-created content, with recent folders and tags for MOCs, CAD work, instructions, and more.

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.

Studio

databases & reference

Studio is BrickLink's free LEGO CAD application, formerly Stud.io, for building, rendering, and generating instructions from virtual models.