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**DOSSIER**\
2026

a cad for early-phase architectural design. walls, doors, windows, slabs, stairs, roofs, levels, and a 2d drawing layer that feels like a 2d drawing layer. one semantic model as the single source of truth — plan, section, elevation, and 3d view are all derived from it, not separate drawings kept in sync by hand. it started as a rhino plugin; it's now its own standalone desktop app, with its own geometry kernel, rendering engine, and file format — no dependency on software you don't own. what exists is either expensive proprietary software, or full bim systems built for office-scale documentation that don't fit how you actually think during a sketch. open source bim tools live in blender or freecad and follow a 3d-first logic — useful, but not how you draw a plan in 2d. dossier is the tool i wanted to use myself, during my master's and in my own work. open data, agpl-licensed, part of the openbureau suite.

[repo](https://dossier.openbureau.ch)