Ashlar-Vellum

Argon
Trial versionArgon: Entry-Level Precision 3D Modeling Software
Windows
Cobalt
Trial versionParametric 3D solid & surface modeling, drafting, rendering.
MacCobalt
Trial versionBuild 3D solid and surface models.
Windows
Graphite
Trial versionCreate 2/3D precision wireframe drawings of unlimited complexity and detail.
Mac
Xenon
Trial versionXenon: Flexible 3D Modeling for Creative Concepts
Windows