BricsCAD
Octave (formerly Bricsys)
€330–€1,176 / year
Dassault Systèmes
$299–$599 / year · 2D + 3D · native DWG
The cautionary tale on this page. DraftSight built its audience as the free AutoCAD-alike, then withdrew the free edition and moved to tiers — the "Standard" light version has been replaced outright. What is left is solid, well-supported Dassault software at a fair price. But if you are choosing it because you remember it being free, that reason is gone. Choose it on the merits or not at all.
Professional $299/yr, Premium $599/yr, Enterprise (network) from $399/yr — all annual subscriptions. Perpetual licences exist but only through resellers, and are not priced publicly. There is no permanently free edition any more; what remains is a 30-day full-featured trial of Premium.
For scale: AutoCAD is ≈ $2,095 / year, subscription only, with no perpetual option at any price.
Pricing and specifications: https://www.draftsight.com/how-to-buy